diff --git a/composer.json b/composer.json
index afd365a..24ae02e 100644
--- a/composer.json
+++ b/composer.json
@@ -11,6 +11,7 @@
 	"minimum-stability": "stable",
 	"require": {
 		"php": ">=5.6",
+		"ext-dom": "*",
 		"guzzlehttp/guzzle": "^6.3"
 	},
 	"require-dev": {
@@ -20,7 +21,11 @@
 		"psr-4": {
 			"HnutiBrontosaurus\\BisApiClient\\": "src/"
 		},
-		"classmap": ["src/exceptions.php"]
+		"classmap": [
+			"src/exceptions.php",
+			"src/Response/exceptions.php",
+			"src/Response/OrganizationalUnit/exceptions.php"
+		]
 	},
 	"config": {
 		"sort-packages": true
diff --git a/src/Client.php b/src/Client.php
index 7cc5c11..02a0951 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -5,14 +5,24 @@
 use GuzzleHttp\Client as HttpClient;
 use GuzzleHttp\Exception\ClientException;
 use GuzzleHttp\Exception\GuzzleException;
-use GuzzleHttp\Exception\TransferException;
 use GuzzleHttp\Psr7\Request;
+use HnutiBrontosaurus\BisApiClient\Request\Adoption;
+use HnutiBrontosaurus\BisApiClient\Request\EventAttendee;
 use HnutiBrontosaurus\BisApiClient\Request\EventParameters;
 use HnutiBrontosaurus\BisApiClient\Request\OrganizationalUnitParameters;
 use HnutiBrontosaurus\BisApiClient\Request\Parameters;
-use HnutiBrontosaurus\BisApiClient\Response\Event;
-use HnutiBrontosaurus\BisApiClient\Response\OrganizationalUnit;
+use HnutiBrontosaurus\BisApiClient\Response\Event\Event;
+use HnutiBrontosaurus\BisApiClient\Response\InvalidContentTypeException;
+use HnutiBrontosaurus\BisApiClient\Response\InvalidParametersException;
+use HnutiBrontosaurus\BisApiClient\Response\InvalidUserInputException;
+use HnutiBrontosaurus\BisApiClient\Response\InvalidXMLStructureException;
+use HnutiBrontosaurus\BisApiClient\Response\OrganizationalUnit\OrganizationalUnit;
+use HnutiBrontosaurus\BisApiClient\Response\OrganizationalUnit\UnknownOrganizationUnitTypeException;
 use HnutiBrontosaurus\BisApiClient\Response\Response;
+use HnutiBrontosaurus\BisApiClient\Response\ResponseErrorException;
+use HnutiBrontosaurus\BisApiClient\Response\UnauthorizedAccessException;
+use HnutiBrontosaurus\BisApiClient\Response\UnknownErrorException;
+use Psr\Http\Message\ResponseInterface;
 
 
 final class Client
@@ -36,6 +46,7 @@ final class Client
 	 * @param string $username
 	 * @param string $password
 	 * @param HttpClient $httpClient
+	 * @throws InvalidArgumentException
 	 */
 	public function __construct($url, $username, $password, HttpClient $httpClient)
 	{
@@ -56,24 +67,26 @@ public function __construct($url, $username, $password, HttpClient $httpClient)
 	}
 
 
+	// events
+
 	/**
 	 * @param int $id
 	 * @param EventParameters $params
 	 * @return Event
-	 * @throws BisClientException
-	 * @throws GuzzleException
-	 * @throws ResourceNotFoundException
+	 * @throws NotFoundException
+	 * @throws TransferErrorException
+	 * @throws ResponseErrorException
 	 */
-	public function getEvent($id, EventParameters $params = NULL)
+	public function getEvent($id, EventParameters $params = null)
 	{
-		$params = ($params !== NULL ? $params : new EventParameters());
+		$params = ($params !== null ? $params : new EventParameters());
 		$params->setId($id);
 		$response = $this->processRequest($params);
 
 		$data = $response->getData();
 
 		if (\count($data) === 0) {
-			throw new BisClientException('No result for event with id `' . $id . '`.');
+			throw new NotFoundException('No result for event with id `' . $id . '`.');
 		}
 
 		return Event::fromResponseData(\reset($data));
@@ -82,99 +95,192 @@ public function getEvent($id, EventParameters $params = NULL)
 	/**
 	 * @param EventParameters $params
 	 * @return Event[]
-	 * @throws BisClientException
-	 * @throws GuzzleException
-	 * @throws ResourceNotFoundException
+	 * @throws NotFoundException
+	 * @throws TransferErrorException
+	 * @throws ResponseErrorException
 	 */
-	public function getEvents(EventParameters $params = NULL)
+	public function getEvents(EventParameters $params = null)
 	{
-		$response = $this->processRequest($params !== NULL ? $params : new EventParameters());
+		$response = $this->processRequest($params !== null ? $params : new EventParameters());
 		$data = $response->getData();
 
-		if ($data === NULL) {
+		if ($data === null) {
 			return [];
 		}
 
 		return \array_map(Event::class . '::fromResponseData', $data);
 	}
 
+	/**
+	 * @param EventAttendee $eventAttendee
+	 * @throws ResponseErrorException
+	 */
+	public function addAttendeeToEvent(EventAttendee $eventAttendee)
+	{
+		$eventAttendee->setCredentials($this->username, $this->password);
+		$response = $this->httpClient->send($this->createRequest($eventAttendee));
+
+		$this->checkForResponseContentType($response);
+
+		$domDocument = $this->generateDOM($response);
+
+		$this->checkForResponseErrors($domDocument);
+	}
+
+
+	// organizational units
+
 	/**
 	 * @param OrganizationalUnitParameters $params
 	 * @return OrganizationalUnit[]
-	 * @throws BisClientException
-	 * @throws GuzzleException
-	 * @throws ResourceNotFoundException
+	 * @throws NotFoundException
+	 * @throws TransferErrorException
+	 * @throws ResponseErrorException
 	 */
-	public function getOrganizationalUnits(OrganizationalUnitParameters $params = NULL)
+	public function getOrganizationalUnits(OrganizationalUnitParameters $params = null)
 	{
-		$response = $this->processRequest($params !== NULL ? $params : new OrganizationalUnitParameters());
-		return \array_map(OrganizationalUnit::class . '::fromResponseData', $response->getData());
+		$response = $this->processRequest($params !== null ? $params : new OrganizationalUnitParameters());
+
+		$organizationalUnits = [];
+		foreach ($response->getData() as $organizationalUnit) {
+			try {
+				$organizationalUnits[] = OrganizationalUnit::fromResponseData($organizationalUnit);
+
+			} catch (UnknownOrganizationUnitTypeException $e) {
+				continue; // In case of unknown type - just ignore it.
+
+			}
+		}
+
+		return $organizationalUnits;
+	}
+
+
+	// adoption
+
+	/**
+	 * @param Adoption $adoption
+	 * @throws ResponseErrorException
+	 */
+	public function saveRequestForAdoption(Adoption $adoption)
+	{
+		$adoption->setCredentials($this->username, $this->password);
+
+		$response = $this->httpClient->send($this->createRequest($adoption));
+
+		$this->checkForResponseContentType($response);
+
+		$domDocument = $this->generateDOM($response);
+
+		$this->checkForResponseErrors($domDocument);
 	}
 
 
 	/**
 	 * @param Parameters $requestParameters
 	 * @return Response
-	 * @throws BisClientException
-	 * @throws GuzzleException
-	 * @throws ResourceNotFoundException
+	 * @throws NotFoundException
+	 * @throws TransferErrorException
+	 * @throws ResponseErrorException
 	 */
 	private function processRequest(Parameters $requestParameters)
 	{
 		$requestParameters->setCredentials($this->username, $this->password);
 
-		$httpRequest = new Request('POST', $this->buildUrl($requestParameters));
-
 		try {
-			$response = $this->httpClient->send($httpRequest);
+			$response = $this->httpClient->send($this->createRequest($requestParameters));
 
 		} catch (ClientException $e) {
-			throw new ResourceNotFoundException('Bis client could not find the queried resource.', 0, $e);
+			throw new NotFoundException('Bis client could not find the queried resource.', 0, $e);
 
-		} catch (TransferException $e) {
-			throw new BisClientException('Unable to process request: transfer error.', 0, $e);
+		} catch (GuzzleException $e) {
+			throw new TransferErrorException('Unable to process request: transfer error.', 0, $e);
 		}
 
+		$this->checkForResponseContentType($response);
+
+		$domDocument = $this->generateDOM($response);
+		$this->checkForResponseErrors($domDocument);
+
+		return new Response($response, $domDocument);
+	}
+
+
+	/**
+	 * @param ResponseInterface $response
+	 * @throws InvalidContentTypeException
+	 */
+	private function checkForResponseContentType(ResponseInterface $response)
+	{
 		if (\strncmp($response->getHeaderLine('Content-Type'), 'text/xml', \strlen('text/xml')) !== 0) {
-			throw new BisClientException('Unable to process response: the response Content-Type is invalid or missing.');
+			throw new InvalidContentTypeException('Unable to process response: the response Content-Type is invalid or missing.');
 		}
+	}
 
+	/**
+	 * @param ResponseInterface $response
+	 * @return \DOMDocument
+	 * @throws InvalidXMLStructureException
+	 */
+	private function generateDOM(ResponseInterface $response)
+	{
 		try {
 			$domDocument = new \DOMDocument();
 			$domDocument->loadXML($response->getBody());
 
 		} catch (\Exception $e) {
-			throw new BisClientException('Unable to process response: response body contains invalid XML.', 0, $e);
+			throw new InvalidXMLStructureException('Unable to process response: response body contains invalid XML.', 0, $e);
 		}
 
+		return $domDocument;
+	}
+
+	/**
+	 * @param \DOMDocument $domDocument
+	 * @throws ResponseErrorException
+	 */
+	private function checkForResponseErrors(\DOMDocument $domDocument)
+	{
 		$resultNode = $domDocument->getElementsByTagName(Response::TAG_RESULT)->item(0);
+		\assert($resultNode instanceof \DOMElement);
+
 		if ($resultNode->hasAttribute(Response::TAG_RESULT_ATTRIBUTE_ERROR)) {
 			switch ($resultNode->getAttribute(Response::TAG_RESULT_ATTRIBUTE_ERROR)) {
+				case 'success': // In case of POST request with form data, BIS returns `<result error="success" />` for some reason... Let's pretend that there is no error in such case because... you know... there is no error!
+					break;
+
+				case 'user':
+					throw new InvalidUserInputException($resultNode);
+					break;
+
 				case 'forbidden':
-					throw new BisClientException('You are not authorized to make such request with given credentials. Or you have simply wrong credentials. :-)');
+					throw new UnauthorizedAccessException();
 					break;
 
 				case 'params':
-					throw new BisClientException('Parameters are invalid.');
+					throw new InvalidParametersException();
 					break;
 
 				default:
-					throw new BisClientException('Unknown error. Error type returned from BIS: `' . $resultNode->getAttribute(Response::TAG_RESULT_ATTRIBUTE_ERROR) . '`');
+					throw new UnknownErrorException($resultNode->getAttribute(Response::TAG_RESULT_ATTRIBUTE_ERROR));
 					break;
 			}
 		}
-
-		return new Response($response, $domDocument);
 	}
 
 	/**
-	 * @param Parameters $params
-	 * @return string
+	 * @return Request
 	 */
-	private function buildUrl(Parameters $params)
+	private function createRequest(Parameters $parameters)
 	{
-		$queryString = $params->getQueryString();
-		return $this->url . ($queryString !== '' ? '?' . $queryString : '');
+		return new Request(
+			'POST',
+			$this->url,
+			[
+				'Content-Type' => 'application/x-www-form-urlencoded',
+			],
+			\http_build_query($parameters->getAll())
+		);
 	}
 
 }
diff --git a/src/Request/Adoption.php b/src/Request/Adoption.php
new file mode 100644
index 0000000..6bf0a87
--- /dev/null
+++ b/src/Request/Adoption.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Request;
+
+
+final class Adoption extends Parameters
+{
+
+	/**
+	 * @param int $amount
+	 * @param string $firstName
+	 * @param string $lastName
+	 * @param string $streetAddress
+	 * @param string $streetNumber
+	 * @param string $postalCode
+	 * @param string $city
+	 * @param string $emailAddress
+	 * @param int|null $preferredUnitOfTypeRegional
+	 * @param int|null $preferredUnitOfTypeBase
+	 * @param bool $excludeFromPublic
+	 */
+	public function __construct(
+		$amount,
+		$firstName,
+		$lastName,
+		$streetAddress,
+		$streetNumber,
+		$postalCode,
+		$city,
+		$emailAddress,
+		$preferredUnitOfTypeRegional = null,
+		$preferredUnitOfTypeBase = null,
+		$excludeFromPublic
+	) {
+		parent::__construct([
+			self::PARAM_QUERY => 'adopce',
+			'f_jmeno' => $firstName,
+			'f_prijmeni' => $lastName,
+			'f_ulice' => $streetAddress . ' ' . $streetNumber,
+			'f_mesto' => $city,
+			'f_psc' => $postalCode,
+			'f_email' => $emailAddress,
+			'f_pohlavi' => null, // not required, but accepted by BIS (values muz/zena)
+			'f_uvest_v_seznamu' => $excludeFromPublic ? 'off' : 'on',
+			'f_clanek' => $preferredUnitOfTypeBase,
+			'f_rc' => $preferredUnitOfTypeRegional,
+			'f_castka' => $amount,
+		]);
+	}
+
+}
diff --git a/src/Request/EventAttendee.php b/src/Request/EventAttendee.php
new file mode 100644
index 0000000..e1e0bdd
--- /dev/null
+++ b/src/Request/EventAttendee.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Request;
+
+
+final class EventAttendee extends Parameters
+{
+
+	/**
+	 * @param int $eventId
+	 * @param string $firstName
+	 * @param string $lastName
+	 * @param string $birthDate
+	 * @param string $phoneNumber
+	 * @param string $emailAddress
+	 * @param string|null $note
+	 * @param string[]|null $questionAnswers
+	 */
+	public function __construct(
+		$eventId,
+		$firstName,
+		$lastName,
+		$birthDate,
+		$phoneNumber,
+		$emailAddress,
+		$note,
+		array $questionAnswers = null
+	) {
+		parent::__construct([
+			self::PARAM_QUERY => 'prihlaska',
+			'akce' => $eventId,
+			'jmeno' => $firstName,
+			'prijmeni' => $lastName,
+			'telefon' => $phoneNumber,
+			'email' => $emailAddress,
+			'datum_narozeni' => $birthDate,
+			'poznamka' => $note,
+		]);
+
+
+		if (\count($questionAnswers) === 0) {
+			return;
+		}
+
+		// currently 3 questions are supported
+		$i = 1;
+		foreach ($questionAnswers as $questionAnswer) {
+			$this->params['add_info' . ($i >= 2 ? '_' . $i : '')] = $questionAnswer; // key syntax is `add_info` for first key and `add_info_X` for any other
+			$i++;
+		}
+	}
+
+}
diff --git a/src/Request/EventParameters.php b/src/Request/EventParameters.php
index f03d707..3046bb7 100644
--- a/src/Request/EventParameters.php
+++ b/src/Request/EventParameters.php
@@ -8,39 +8,10 @@
 final class EventParameters extends Parameters
 {
 
-	const FILTER_CLUB = 1;
-	const FILTER_WEEKEND = 2;
-	const FILTER_CAMP = 4;
-	const FILTER_EKOSTAN = 8;
-
-	const TYPE_WORK = 'pracovni';
-	const TYPE_EXPERIENCE = 'prozitkova';
-	const TYPE_SPORT = 'sportovni';
-	const TYPE_EDUCATIONAL = 'vzdelavaci';
-	const TYPE_COURSE = 'prednaska';
-	const TYPE_PUBLIC = 'verejnost';
-	const TYPE_CLUB = 'klub';
-	const TYPE_OHB = 'ohb';
-
-	const PROGRAM_NATURE = 'ap';
-	const PROGRAM_SIGHTS = 'pamatky';
-	const PROGRAM_BRDO = 'brdo';
-	const PROGRAM_EKOSTAN = 'ekostan';
-	const PROGRAM_PSB = 'psb';
-	const PROGRAM_EDUCATION = 'vzdelavani';
-
-	const FOR_ADULTS = 'dospeli';
-	const FOR_CHILDREN = 'deti';
-	const FOR_FAMILIES = 'detirodice';
-
-	const PARAM_DATE_FORMAT = 'Y-m-d';
-
-	const PARAM_DISPLAY_ALREADY_STARTED_KEY = 'aktualni';
-	const PARAM_DISPLAY_ALREADY_STARTED_NO = 'od';
-	const PARAM_DISPLAY_ALREADY_STARTED_YES = 'do';
+	const PARAM_DISPLAY_ALREADY_STARTED_KEY = 'probihajici'; // for default just omit this parameter
+	const PARAM_DISPLAY_ALREADY_STARTED_VALUE = ''; // whatever value
 
-	const PARAM_ORDER_BY_KEY = 'razeni';
-	const PARAM_ORDER_BY_START_DATE = 'od';
+	const PARAM_ORDER_BY_KEY = 'sort'; // for default sorting just omit this parameter
 	const PARAM_ORDER_BY_END_DATE = 'do';
 
 
@@ -48,7 +19,7 @@ public function __construct()
 	{
 		parent::__construct([
 			self::PARAM_QUERY => 'akce',
-			self::PARAM_DISPLAY_ALREADY_STARTED_KEY => self::PARAM_DISPLAY_ALREADY_STARTED_YES,
+			self::PARAM_DISPLAY_ALREADY_STARTED_KEY => self::PARAM_DISPLAY_ALREADY_STARTED_VALUE,
 			self::PARAM_ORDER_BY_KEY => self::PARAM_ORDER_BY_END_DATE,
 		]);
 	}
@@ -64,10 +35,24 @@ public function setId($id)
 		return $this;
 	}
 
+
+	// filter
+
+	const FILTER_CLUB = 1;
+	const FILTER_WEEKEND = 2;
+	const FILTER_CAMP = 4;
+	const FILTER_EKOSTAN = 8;
+
 	/**
-	 * Beside standard constant usage as a paramer, you can pass bitwise operation argument, e.g. `EventParameters::FILTER_WEEKEND|EventParameters::FILTER_CAMP`.
+	 * This parameter serves as combinator for multiple conditions, which can not be achieved with concatenating type, program, target group or any other available parameters.
+	 * For example you can not make an union among different parameters. Let's say you want all events which are of type=ohb or of program=brdo. This is not possible with API parameters.
+	 * Thus you can take advantage of preset filters which are documented here: https://bis.brontosaurus.cz/myr.php
+	 *
+	 * Beside standard constant usage as a parameter, you can pass bitwise operation argument, e.g. `EventParameters::FILTER_WEEKEND|EventParameters::FILTER_CAMP`.
+	 *
 	 * @param int $filter
 	 * @return self
+	 * @throws InvalidArgumentException
 	 */
 	public function setFilter($filter)
 	{
@@ -104,22 +89,55 @@ public function setFilter($filter)
 		return $this;
 	}
 
+
+	// type
+
+	const TYPE_VOLUNTARY = 'pracovni'; // dobrovolnická
+	const TYPE_EXPERIENCE = 'prozitkova'; // zážitková
+	const TYPE_SPORT = 'sportovni';
+
+	const TYPE_EDUCATIONAL_TALK = 'prednaska'; // vzdělávací - přednášky
+	const TYPE_EDUCATIONAL_COURSES = 'vzdelavaci'; // vzdělávací - kurzy, školení
+	const TYPE_EDUCATIONAL_OHB = 'ohb'; // vzdělávací - kurz ohb
+	const TYPE_LEARNING_PROGRAM = 'vyuka'; // výukový program
+	const TYPE_RESIDENTIAL_LEARNING_PROGRAM = 'pobyt'; // pobytový výukový program
+
+	const TYPE_CLUB_MEETUP = 'klub'; // klub - setkání
+	const TYPE_CLUB_TALK = 'klub-predn'; // klub - přednáška
+	const TYPE_FOR_PUBLIC = 'verejnost'; // akce pro veřejnost
+	const TYPE_EKOSTAN = 'ekostan';
+	const TYPE_EXHIBITION = 'vystava';
+	const TYPE_ACTION_GROUP = 'akcni'; // akční skupina
+	const TYPE_INTERNAL = 'jina'; // interní akce (VH a jiné)
+	const TYPE_GROUP_MEETING = 'schuzka'; // oddílová, družinová schůzka
+
 	/**
 	 * @param string $type
 	 * @return self
+	 * @throws InvalidArgumentException
 	 */
 	public function setType($type)
 	{
-		if (!\in_array($type, [
-			self::TYPE_WORK,
+		if ( ! \in_array($type, [
+			self::TYPE_VOLUNTARY,
 			self::TYPE_EXPERIENCE,
 			self::TYPE_SPORT,
-			self::TYPE_EDUCATIONAL,
-			self::TYPE_COURSE,
-			self::TYPE_PUBLIC,
-			self::TYPE_CLUB,
-			self::TYPE_OHB,
-		], TRUE)) {
+
+			self::TYPE_EDUCATIONAL_TALK,
+			self::TYPE_EDUCATIONAL_COURSES,
+			self::TYPE_EDUCATIONAL_OHB,
+			self::TYPE_LEARNING_PROGRAM,
+			self::TYPE_RESIDENTIAL_LEARNING_PROGRAM,
+
+			self::TYPE_CLUB_MEETUP,
+			self::TYPE_CLUB_TALK,
+			self::TYPE_FOR_PUBLIC,
+			self::TYPE_EKOSTAN,
+			self::TYPE_EXHIBITION,
+			self::TYPE_ACTION_GROUP,
+			self::TYPE_INTERNAL,
+			self::TYPE_GROUP_MEETING,
+		], true)) {
 			throw new InvalidArgumentException('Value `' . $type . '` is not of valid types for `type` parameter.');
 		}
 
@@ -140,20 +158,33 @@ public function setTypes(array $types)
 		return $this;
 	}
 
+
+	// program
+
+	const PROGRAM_NOT_SELECTED = 'none';
+	const PROGRAM_NATURE = 'ap';
+	const PROGRAM_SIGHTS = 'pamatky';
+	const PROGRAM_BRDO = 'brdo';
+	const PROGRAM_EKOSTAN = 'ekostan';
+	const PROGRAM_PSB = 'psb';
+	const PROGRAM_EDUCATION = 'vzdelavani';
+
 	/**
 	 * @param string $program
 	 * @return self
+	 * @throws InvalidArgumentException
 	 */
 	public function setProgram($program)
 	{
-		if (!\in_array($program, [
+		if ( ! \in_array($program, [
+			self::PROGRAM_NOT_SELECTED,
 			self::PROGRAM_NATURE,
 			self::PROGRAM_SIGHTS,
 			self::PROGRAM_BRDO,
 			self::PROGRAM_EKOSTAN,
 			self::PROGRAM_PSB,
 			self::PROGRAM_EDUCATION,
-		], TRUE)) {
+		], true)) {
 			throw new InvalidArgumentException('Value `' . $program . '` is not of valid types for `program` parameter.');
 		}
 
@@ -174,49 +205,54 @@ public function setPrograms(array $programs)
 		return $this;
 	}
 
+
+	// target group
+
+	const TARGET_GROUP_EVERYONE = 'vsichni';
+	const TARGET_GROUP_ADULTS = 'dospeli';
+	const TARGET_GROUP_CHILDREN = 'deti';
+	const TARGET_GROUP_FAMILIES = 'detirodice';
+	const TARGET_GROUP_FIRST_TIME_ATTENDEES = 'prvouc';
+
 	/**
-	 * @param string $for
+	 * @param string $targetGroup
 	 * @return self
+	 * @throws InvalidArgumentException
 	 */
-	public function setFor($for)
+	public function setTargetGroup($targetGroup)
 	{
-		if (!\in_array($for, [
-			self::FOR_ADULTS,
-			self::FOR_CHILDREN,
-			self::FOR_FAMILIES,
-		], TRUE)) {
-			throw new InvalidArgumentException('Value `' . $for . '` is not of valid types for `for` parameter.');
+		if ( ! \in_array($targetGroup, [
+			self::TARGET_GROUP_EVERYONE,
+			self::TARGET_GROUP_ADULTS,
+			self::TARGET_GROUP_CHILDREN,
+			self::TARGET_GROUP_FAMILIES,
+			self::TARGET_GROUP_FIRST_TIME_ATTENDEES,
+		], true)) {
+			throw new InvalidArgumentException('Value `' . $targetGroup . '` is not of valid types for `for` parameter.');
 		}
 
-		$this->params['pro'] = $for;
+		$this->params['pro'][] = $targetGroup;
 		return $this;
 	}
 
 	/**
-	 * @param int|int[] $unitIds
+	 * @param string[] $targetGroups
 	 * @return self
 	 */
-	public function setOrganizedBy($unitIds)
+	public function setTargetGroups(array $targetGroups)
 	{
-		$organizedByKey = 'zc';
-
-		// If just single value, wrap it into an array.
-		if (!\is_array($unitIds)) {
-			$unitIds = [$unitIds];
-		}
-
-		foreach ($unitIds as $unitId) {
-			// If such value is not present yet, initialize it with an empty array.
-			if (!\is_array($this->params[$organizedByKey])) {
-				$this->params[$organizedByKey] = [];
-			}
-
-			$this->params[$organizedByKey][] = (int) $unitId;
+		foreach ($targetGroups as $targetGroup) {
+			$this->setTargetGroup($targetGroup);
 		}
 
 		return $this;
 	}
 
+
+	// date constraints
+
+	const PARAM_DATE_FORMAT = 'Y-m-d';
+
 	/**
 	 * @param \DateTimeImmutable $dateFrom
 	 * @return self
@@ -252,16 +288,44 @@ public function setYear($year)
 	 */
 	public function hideTheseAlreadyStarted()
 	{
-		$this->params[self::PARAM_DISPLAY_ALREADY_STARTED_KEY] = self::PARAM_DISPLAY_ALREADY_STARTED_NO;
+		unset($this->params[self::PARAM_DISPLAY_ALREADY_STARTED_KEY]);
 		return $this;
 	}
 
+
+	// miscellaneous
+
 	/**
 	 * @return self
 	 */
 	public function orderByStartDate()
 	{
-		$this->params[self::PARAM_ORDER_BY_KEY] = self::PARAM_ORDER_BY_START_DATE;
+		unset($this->params[self::PARAM_ORDER_BY_KEY]);
+		return $this;
+	}
+
+	/**
+	 * @param int|int[] $unitIds
+	 * @return self
+	 */
+	public function setOrganizedBy($unitIds)
+	{
+		$organizedByKey = 'zc';
+
+		// If just single value, wrap it into an array.
+		if ( ! \is_array($unitIds)) {
+			$unitIds = [$unitIds];
+		}
+
+		foreach ($unitIds as $unitId) {
+			// If such value is not present yet, initialize it with an empty array.
+			if ( ! \is_array($this->params[$organizedByKey])) {
+				$this->params[$organizedByKey] = [];
+			}
+
+			$this->params[$organizedByKey][] = (int) $unitId;
+		}
+
 		return $this;
 	}
 
diff --git a/src/Request/OrganizationalUnitParameters.php b/src/Request/OrganizationalUnitParameters.php
index bd544e1..4a0c339 100644
--- a/src/Request/OrganizationalUnitParameters.php
+++ b/src/Request/OrganizationalUnitParameters.php
@@ -25,6 +25,8 @@ public function __construct()
 
 	/**
 	 * @param string $type
+	 * @return self
+	 * @throws InvalidArgumentException
 	 */
 	public function setType($type)
 	{
@@ -32,11 +34,13 @@ public function setType($type)
 			self::TYPE_CLUB,
 			self::TYPE_BASE,
 			self::TYPE_REGIONAL,
-		], TRUE)) {
+		], true)) {
 			throw new InvalidArgumentException('Type `' . $type . '` is not of valid types.');
 		}
 
 		$this->params[self::PARAM_FILTER] = $type;
+
+		return $this;
 	}
 
 }
diff --git a/src/Request/Parameters.php b/src/Request/Parameters.php
index 0df7395..d8c63d8 100644
--- a/src/Request/Parameters.php
+++ b/src/Request/Parameters.php
@@ -1,7 +1,7 @@
 <?php
 
 /**
- * See https://bis.brontosaurus.cz/myr.html for more information on values.
+ * See https://bis.brontosaurus.cz/myr.php for more information on values.
  */
 
 namespace HnutiBrontosaurus\BisApiClient\Request;
diff --git a/src/Response/Event.php b/src/Response/Event.php
deleted file mode 100644
index 385fadf..0000000
--- a/src/Response/Event.php
+++ /dev/null
@@ -1,446 +0,0 @@
-<?php
-
-namespace HnutiBrontosaurus\BisApiClient\Response;
-
-
-final class Event
-{
-
-	/** @var int */
-	private $id;
-
-	/** @var string */
-	private $name;
-
-	/** @var \DateTimeImmutable */
-	private $dateFrom;
-
-	/** @var \DateTimeImmutable */
-	private $dateUntil;
-
-	/** @var string */
-	private $type;
-
-	/** @var Program|NULL */
-	private $program;
-
-	/** @var Place */
-	private $place;
-
-	/** @var bool */
-	private $enableWebRegistration = FALSE;
-
-	/** @var RegistrationQuestion[]|array */
-	private $webRegistrationQuestions = [];
-
-	/** @var int|NULL */
-	private $ageFrom;
-
-	/** @var int|NULL */
-	private $ageUntil;
-
-	/**
-	 * Single number, interval or null.
-	 * @var int|string|null
-	 */
-	private $price;
-
-	/** @var Organizer */
-	private $organizer;
-
-	/** @var string|NULL */
-	private $invitationText;
-
-	/** @var string|NULL */
-	private $workDescription;
-
-	/** @var string|NULL */
-	private $meetingInformation;
-
-	/** @var int|NULL */
-	private $workingTime;
-
-	/** @var string|NULL */
-	private $programDescription;
-
-	/** @var string|NULL */
-	private $accommodation;
-
-	/** @var string|NULL */
-	private $food;
-
-	/** @var string|NULL */
-	private $notes;
-
-	/** @var array */
-	private $attachments = [];
-
-
-	/**
-	 * Event constructor.
-	 * @param int $id
-	 * @param string $name
-	 * @param \DateTimeImmutable $dateFrom
-	 * @param \DateTimeImmutable $dateUntil
-	 * @param string $type
-	 * @param string|NULL $programSlug
-	 * @param string|NULL $programName
-	 * @param int|NULL $placeId
-	 * @param string $placeName
-	 * @param string|NULL $webRegistrationQuestion1
-	 * @param string|NULL $webRegistrationQuestion2
-	 * @param string|NULL $webRegistrationQuestion3
-	 * @param int|NULL $ageFrom
-	 * @param int|NULL $ageUntil
-	 * @param int|string|NULL $price
-	 * @param bool $enableWebRegistration
-	 * @param int|NULL $organizationalUnitId
-	 * @param string|NULL $organizationalUnitName
-	 * @param string|NULL $organizers
-	 * @param string|NULL $contactPersonName
-	 * @param string $contactPhone
-	 * @param string $contactEmail
-	 * @param string|NULL $contactWebsite
-	 * @param string|NULL $invitationText
-	 * @param string|NULL $workDescription
-	 * @param string|NULL $meetingInformation
-	 * @param string|NULL $responsiblePerson
-	 * @param int|NULL $workingTime
-	 * @param string|NULL $programDescription
-	 * @param string|NULL $accommodation
-	 * @param string|NULL $food
-	 * @param string|NULL $notes
-	 * @param string|NULL $mapLinkOrCoords
-	 * @param string|NULL $attachment1
-	 * @param string|NULL $attachment2
-	 */
-	public function __construct(
-		$id,
-		$name,
-		\DateTimeImmutable $dateFrom,
-		\DateTimeImmutable $dateUntil,
-		$type,
-		$programSlug = NULL,
-		$programName = NULL,
-		$placeId = NULL,
-		$placeName,
-		$webRegistrationQuestion1 = NULL,
-		$webRegistrationQuestion2 = NULL,
-		$webRegistrationQuestion3 = NULL,
-		$ageFrom = NULL,
-		$ageUntil = NULL,
-		$price = NULL,
-		$enableWebRegistration,
-		$organizationalUnitId = NULL,
-		$organizationalUnitName = NULL,
-		$organizers = NULL,
-		$contactPersonName = NULL,
-		$contactPhone,
-		$contactEmail,
-		$contactWebsite = NULL,
-		$invitationText = NULL,
-		$workDescription = NULL,
-		$meetingInformation = NULL,
-		$responsiblePerson = NULL,
-		$workingTime = NULL,
-		$programDescription = NULL,
-		$accommodation = NULL,
-		$food = NULL,
-		$notes = NULL,
-		$mapLinkOrCoords = NULL,
-		$attachment1 = NULL,
-		$attachment2 = NULL
-	) {
-		$this->id = $id;
-		$this->name = $name;
-		$this->dateFrom = $dateFrom;
-		$this->dateUntil = $dateUntil;
-		$this->type = $type;
-		$this->place = new Place($placeId, $placeName, $mapLinkOrCoords);
-		$this->ageFrom = $ageFrom;
-		$this->ageUntil = $ageUntil;
-		$this->price = $price;
-		$this->invitationText = $invitationText;
-		$this->workDescription = $workDescription;
-		$this->meetingInformation = $meetingInformation;
-		$this->workingTime = $workingTime;
-		$this->programDescription = $programDescription;
-		$this->accommodation = $accommodation;
-		$this->food = $food;
-		$this->notes = $notes;
-
-
-		// program
-
-		if ($programSlug !== NULL && $programName !== NULL) {
-			$this->program = new Program($programSlug, $programName);
-		}
-
-
-		// web registration
-
-		$this->enableWebRegistration = $enableWebRegistration;
-
-		$this->webRegistrationQuestions = \array_map(function ($webRegistrationQuestion) { // And then turn the rest into objects.
-			return new RegistrationQuestion($webRegistrationQuestion);
-		}, \array_filter([ // First exclude all null items.
-			$webRegistrationQuestion1,
-			$webRegistrationQuestion2,
-			$webRegistrationQuestion3,
-		], function ($v, $k) {
-			return $v !== NULL;
-		}, ARRAY_FILTER_USE_BOTH));
-
-
-		// organizers
-
-		$this->organizer = new Organizer(
-			($organizationalUnitId !== NULL && $organizationalUnitName !== NULL) ? new OrganizerOrganizationalUnit($organizationalUnitId, $organizationalUnitName) : NULL,
-			$responsiblePerson,
-			$organizers,
-			$contactPersonName,
-			$contactPhone,
-			$contactEmail,
-			$contactWebsite
-		);
-
-
-		// attachments
-
-		if ($attachment1 !== NULL) {
-			$this->attachments[] = $attachment1;
-		}
-		if ($attachment2 !== NULL) {
-			$this->attachments[] = $attachment2;
-		}
-	}
-
-
-	public static function fromResponseData(array $data)
-	{
-		$price = NULL;
-		if ($data['poplatek'] !== '') {
-			$price = $data['poplatek'];
-
-			if (\preg_match('|^[0-9]+$|', $price)) {
-				$price = (int)$price;
-			}
-		}
-
-		return new self(
-			(int)$data['id'],
-			$data['nazev'],
-			\DateTimeImmutable::createFromFormat('Y-m-d', $data['od']),
-			\DateTimeImmutable::createFromFormat('Y-m-d', $data['do']),
-			$data['typ'],
-			$data['program_id'] !== '' ? $data['program_id'] : NULL,
-			$data['program'] !== '' ? $data['program'] : NULL,
-			$data['lokalita_id'] !== '' ? ((int)$data['lokalita_id']) : NULL,
-			$data['lokalita'],
-			$data['add_info_title'] !== '' ? $data['add_info_title'] : NULL,
-			$data['add_info_title_2'] !== '' ? $data['add_info_title_2'] : NULL,
-			$data['add_info_title_3'] !== '' ? $data['add_info_title_3'] : NULL,
-			$data['vek_od'] !== '' ? ((int)$data['vek_od']) : NULL,
-			$data['vek_do'] !== '' ? ((int)$data['vek_do']) : NULL,
-			$price,
-			$data['prihlaska'] == 1, // intentionally ==
-			$data['porada_id'] !== '' ? ((int)$data['porada_id']) : NULL,
-			$data['porada'] !== '' ? $data['porada'] : NULL,
-			$data['org'] !== '' ? $data['org'] : NULL,
-			$data['kontakt'] !== '' ? $data['kontakt'] : NULL,
-			$data['kontakt_telefon'],
-			$data['kontakt_email'],
-			$data['web'] !== '' ? $data['web'] : NULL,
-			$data['text'] !== '' ? $data['text'] : NULL,
-			$data['prace'] !== '' ? $data['prace'] : NULL,
-			$data['sraz'] !== '' ? $data['sraz'] : NULL,
-			$data['odpovedna'] !== '' ? $data['odpovedna'] : NULL,
-			$data['pracovni_doba'] !== '' ? ((int)$data['pracovni_doba']) : NULL,
-			$data['popis_programu'] !== '' ? $data['popis_programu'] : NULL,
-			$data['ubytovani'] !== '' ? $data['ubytovani'] : NULL,
-			$data['strava'] !== '' ? $data['strava'] : NULL,
-			$data['jak_se_prihlasit'] !== '' ? $data['jak_se_prihlasit'] : NULL,
-			$data['lokalita_mapa'] !== '' ? $data['lokalita_mapa'] : NULL,
-			$data['priloha_1'] !== '' ? $data['priloha_1'] : NULL,
-			$data['priloha_2'] !== '' ? $data['priloha_2'] : NULL
-		);
-	}
-
-
-	/**
-	 * @return int
-	 */
-	public function getId()
-	{
-		return $this->id;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getName()
-	{
-		return $this->name;
-	}
-
-	/**
-	 * @return \DateTimeImmutable
-	 */
-	public function getDateFrom()
-	{
-		return $this->dateFrom;
-	}
-
-	/**
-	 * @return \DateTimeImmutable
-	 */
-	public function getDateUntil()
-	{
-		return $this->dateUntil;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getType()
-	{
-		return $this->type;
-	}
-
-	/**
-	 * @return Program|NULL
-	 */
-	public function getProgram()
-	{
-		return $this->program;
-	}
-
-	/**
-	 * @return Place
-	 */
-	public function getPlace()
-	{
-		return $this->place;
-	}
-
-	/**
-	 * @return bool
-	 */
-	public function isEnableWebRegistration()
-	{
-		return $this->enableWebRegistration;
-	}
-
-	/**
-	 * @return RegistrationQuestion[]|array
-	 */
-	public function getWebRegistrationQuestions()
-	{
-		return $this->webRegistrationQuestions;
-	}
-
-	/**
-	 * @return int|NULL
-	 */
-	public function getAgeFrom()
-	{
-		return $this->ageFrom;
-	}
-
-	/**
-	 * @return int|NULL
-	 */
-	public function getAgeUntil()
-	{
-		return $this->ageUntil;
-	}
-
-	/**
-	 * @return int|string|NULL
-	 */
-	public function getPrice()
-	{
-		return $this->price;
-	}
-
-	/**
-	 * @return Organizer
-	 */
-	public function getOrganizer()
-	{
-		return $this->organizer;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getInvitationText()
-	{
-		return $this->invitationText;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getWorkDescription()
-	{
-		return $this->workDescription;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getMeetingInformation()
-	{
-		return $this->meetingInformation;
-	}
-
-	/**
-	 * @return int|NULL
-	 */
-	public function getWorkingTime()
-	{
-		return $this->workingTime;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getProgramDescription()
-	{
-		return $this->programDescription;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getAccommodation()
-	{
-		return $this->accommodation;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getFood()
-	{
-		return $this->food;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getNotes()
-	{
-		return $this->notes;
-	}
-
-	/**
-	 * @return array
-	 */
-	public function getAttachments()
-	{
-		return $this->attachments;
-	}
-
-}
diff --git a/src/Response/Event/Event.php b/src/Response/Event/Event.php
new file mode 100644
index 0000000..f19ca55
--- /dev/null
+++ b/src/Response/Event/Event.php
@@ -0,0 +1,519 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event;
+
+use HnutiBrontosaurus\BisApiClient\BadUsageException;
+use HnutiBrontosaurus\BisApiClient\InvalidArgumentException;
+use HnutiBrontosaurus\BisApiClient\Response\Event\Invitation\Invitation;
+use HnutiBrontosaurus\BisApiClient\Response\Event\Registration\RegistrationType;
+use HnutiBrontosaurus\BisApiClient\Response\RegistrationTypeException;
+
+
+final class Event
+{
+
+	/** @var int */
+	private $id;
+
+	/** @var string */
+	private $name;
+
+	/** @var string|null */
+	private $coverPhotoPath;
+
+	/** @var \DateTimeImmutable */
+	private $dateFrom;
+
+	/** @var string|null */
+	private $timeFrom;
+
+	/** @var \DateTimeImmutable */
+	private $dateUntil;
+
+	/** @var string */
+	private $type;
+
+	/** @var Program */
+	private $program;
+
+	/** @var Place */
+	private $place;
+
+	/** @var RegistrationType */
+	private $registrationType;
+
+	/** @var int|null */
+	private $ageFrom;
+
+	/** @var int|null */
+	private $ageUntil;
+
+	/**
+	 * Single number or interval.
+	 * @var int|string
+	 */
+	private $price;
+
+	/** @var Organizer */
+	private $organizer;
+
+	/** @var TargetGroup */
+	private $targetGroup;
+
+	/** @var Invitation|null */
+	private $invitation;
+
+	/** @var string|null */
+	private $programDescription;
+
+	/** @var string|null */
+	private $notes;
+
+	/** @var string|null */
+	private $relatedWebsite;
+
+
+	/**
+	 * @param int $id
+	 * @param string $name
+	 * @param string|null $coverPhotoPath
+	 * @param \DateTimeImmutable $dateFrom
+	 * @param \DateTimeImmutable $dateUntil
+	 * @param string $type
+	 * @param string|null $programSlug
+	 * @param string|null $programName
+	 * @param string $placeName
+	 * @param string|null $placeAlternativeName
+	 * @param string|null $placeCoordinates
+	 * @param int $registrationType
+	 * @param string|null $webRegistrationQuestion1
+	 * @param string|null $webRegistrationQuestion2
+	 * @param string|null $webRegistrationQuestion3
+	 * @param string|null $registrationCustomUrl
+	 * @param int|null $ageFrom
+	 * @param int|null $ageUntil
+	 * @param int|string $price
+	 * @param int|null $organizationalUnitId
+	 * @param string|null $organizationalUnitName
+	 * @param string|null $organizers
+	 * @param string|null $contactPersonName
+	 * @param string $contactPhone
+	 * @param string $contactEmail
+	 * @param int $targetGroupId
+	 * @param string|null $invitationOrganizationalInformation
+	 * @param string|null $invitationIntroduction
+	 * @param string|null $invitationPresentationText
+	 * @param array $invitationPresentationPhotos
+	 * @param string|null $invitationWorkDescription
+	 * @param string|null $timeFrom
+	 * @param string|null $responsiblePerson
+	 * @param int|null $workHoursPerDay
+	 * @param string|null $programDescription
+	 * @param string|null $accommodation
+	 * @param string|null $food
+	 * @param string|null $notes
+	 * @param string|null $relatedWebsite
+	 * @throws RegistrationTypeException
+	 * @throws BadUsageException
+	 */
+	private function __construct(
+		$id,
+		$name,
+		$coverPhotoPath = null,
+		\DateTimeImmutable $dateFrom,
+		\DateTimeImmutable $dateUntil,
+		$type,
+		$programSlug = null,
+		$programName = null,
+		$placeName,
+		$placeAlternativeName = null,
+		$placeCoordinates = null,
+		$registrationType,
+		$webRegistrationQuestion1 = null,
+		$webRegistrationQuestion2 = null,
+		$webRegistrationQuestion3 = null,
+		$registrationCustomUrl = null,
+		$ageFrom = null,
+		$ageUntil = null,
+		$price = null,
+		$organizationalUnitId = null,
+		$organizationalUnitName = null,
+		$organizers = null,
+		$contactPersonName = null,
+		$contactPhone,
+		$contactEmail,
+		$targetGroupId,
+		$invitationOrganizationalInformation = null,
+		$invitationIntroduction = null,
+		$invitationPresentationText = null,
+		array $invitationPresentationPhotos = [],
+		$invitationWorkDescription = null,
+		$timeFrom = null,
+		$responsiblePerson = null,
+		$workHoursPerDay = null,
+		$programDescription = null,
+		$accommodation = null,
+		$food = null,
+		$notes = null,
+		$relatedWebsite = null
+	) {
+		$this->id = $id;
+		$this->name = $name;
+		$this->dateFrom = $dateFrom;
+		$this->dateUntil = $dateUntil;
+		$this->type = $type;
+		$this->place = Place::from($placeName, $placeAlternativeName, $placeCoordinates);
+		$this->ageFrom = $ageFrom;
+		$this->ageUntil = $ageUntil;
+		$this->price = $price;
+		$this->timeFrom = $timeFrom;
+		$this->programDescription = $programDescription;
+		$this->notes = $notes;
+
+
+		// cover photo
+
+		if ($coverPhotoPath !== null) {
+			$this->coverPhotoPath = $coverPhotoPath;
+		}
+
+
+		// program
+
+		$this->program = Program::from($programSlug, $programName);
+
+
+		// registration
+
+		$registrationQuestions = \array_filter([ // exclude all null items
+			$webRegistrationQuestion1,
+			$webRegistrationQuestion2,
+			$webRegistrationQuestion3,
+		], function ($v, $k) {
+			return $v !== null;
+		}, ARRAY_FILTER_USE_BOTH);
+		$this->registrationType = RegistrationType::from($registrationType, $registrationQuestions, $contactEmail, $registrationCustomUrl);
+
+
+		// organizers
+
+		$this->organizer = Organizer::from(
+			$organizationalUnitId,
+			$organizationalUnitName,
+			$responsiblePerson,
+			$organizers,
+			$contactPersonName,
+			$contactPhone,
+			$contactEmail
+		);
+
+
+		// target group
+		$this->targetGroup = TargetGroup::from($targetGroupId);
+
+
+		// invitation
+
+		$this->invitation = Invitation::from(
+			$invitationIntroduction,
+			$invitationOrganizationalInformation,
+			$accommodation,
+			$food,
+			$invitationWorkDescription,
+			$workHoursPerDay,
+			$invitationPresentationText,
+			$invitationPresentationPhotos
+		);
+
+
+		// related website
+
+		if ($relatedWebsite !== null) {
+			if ( ! self::startsWith($relatedWebsite, 'http')) { // count with no protocol typed URLs
+				$relatedWebsite = 'http://' . $relatedWebsite;
+			}
+
+			$this->relatedWebsite = $relatedWebsite;
+		}
+	}
+
+
+	/**
+	 * @param string[] $data Everything is string as it comes from HTTP response body.
+	 * @return self
+	 * @throws RegistrationTypeException
+	 * @throws BadUsageException
+	 */
+	public static function fromResponseData(array $data)
+	{
+		$price = 0;
+		if (isset($data['poplatek']) && $data['poplatek'] !== '') {
+			$price = $data['poplatek'];
+
+			if (\preg_match('|^[0-9]+$|', $price)) {
+				$price = (int) $price;
+			}
+		}
+
+		// BIS API returns "0", "1", "2" etc. for real options and "" when nothing is set
+		$food = (isset($data['strava']) && $data['strava'] !== '') ? (int) $data['strava'] : null;
+
+		$invitationPresentationPhotos = [];
+		if (isset($data['ochutnavka_1']) && $data['ochutnavka_1'] !== '') {
+			$invitationPresentationPhotos[] = $data['ochutnavka_1'];
+		}
+		if (isset($data['ochutnavka_2']) && $data['ochutnavka_2'] !== '') {
+			$invitationPresentationPhotos[] = $data['ochutnavka_2'];
+		}
+		if (isset($data['ochutnavka_3']) && $data['ochutnavka_3'] !== '') {
+			$invitationPresentationPhotos[] = $data['ochutnavka_3'];
+		}
+		if (isset($data['ochutnavka_4']) && $data['ochutnavka_4'] !== '') {
+			$invitationPresentationPhotos[] = $data['ochutnavka_4'];
+		}
+		if (isset($data['ochutnavka_5']) && $data['ochutnavka_5'] !== '') {
+			$invitationPresentationPhotos[] = $data['ochutnavka_5'];
+		}
+		if (isset($data['ochutnavka_6']) && $data['ochutnavka_6'] !== '') {
+			$invitationPresentationPhotos[] = $data['ochutnavka_6'];
+		}
+
+		return new self(
+			(int) $data['id'],
+			$data['nazev'],
+			(isset($data['foto_hlavni']) && $data['foto_hlavni'] !== '') ? $data['foto_hlavni'] : null,
+			\DateTimeImmutable::createFromFormat('Y-m-d', $data['od']),
+			\DateTimeImmutable::createFromFormat('Y-m-d', $data['do']),
+			$data['typ'],
+			(isset($data['program_id']) && $data['program_id'] !== '') ? $data['program_id'] : null,
+			(isset($data['program']) && $data['program'] !== '') ? $data['program'] : null,
+			$data['lokalita'],
+			(isset($data['lokalita_misto']) && $data['lokalita_misto'] !== '') ? $data['lokalita_misto'] : null,
+			(isset($data['lokalita_gps']) && $data['lokalita_gps'] !== '') ? $data['lokalita_gps'] : null,
+			(int) $data['prihlaska'],
+			(isset($data['add_info_title']) && $data['add_info_title'] !== '') ? $data['add_info_title'] : null,
+			(isset($data['add_info_title_2']) && $data['add_info_title_2'] !== '') ? $data['add_info_title_2'] : null,
+			(isset($data['add_info_title_3']) && $data['add_info_title_3'] !== '') ? $data['add_info_title_3'] : null,
+			(isset($data['kontakt_url']) && $data['kontakt_url'] !== '') ? $data['kontakt_url'] : null,
+			(isset($data['vek_od']) && $data['vek_od'] !== '') ? ((int) $data['vek_od']) : null,
+			(isset($data['vek_do']) && $data['vek_do'] !== '') ? ((int) $data['vek_do']) : null,
+			$price,
+			(isset($data['porada_id']) && $data['porada_id'] !== '') ? ((int)$data['porada_id']) : null,
+			(isset($data['porada']) && $data['porada'] !== '') ? $data['porada'] : null,
+			(isset($data['org']) && $data['org'] !== '') ? $data['org'] : null,
+			(isset($data['kontakt']) && $data['kontakt'] !== '') ? $data['kontakt'] : null,
+			$data['kontakt_telefon'],
+			$data['kontakt_email'],
+			(int) $data['prokoho'],
+			(isset($data['text_info']) && $data['text_info'] !== '') ? $data['text_info'] : null,
+			(isset($data['text_uvod']) && $data['text_uvod'] !== '') ? $data['text_uvod'] : null,
+			(isset($data['text_mnam']) && $data['text_mnam'] !== '') ? $data['text_mnam'] : null,
+			$invitationPresentationPhotos,
+			(isset($data['text_dobr']) && $data['text_dobr'] !== '') ? $data['text_dobr'] : null,
+			(isset($data['sraz']) && $data['sraz'] !== '') ? $data['sraz'] : null,
+			(isset($data['odpovedna']) && $data['odpovedna'] !== '') ? $data['odpovedna'] : null,
+			(isset($data['pracovni_doba']) && $data['pracovni_doba'] !== '') ? ((int) $data['pracovni_doba']) : null,
+			(isset($data['popis_programu']) && $data['popis_programu'] !== '') ? $data['popis_programu'] : null,
+			(isset($data['ubytovani']) && $data['ubytovani'] !== '') ? $data['ubytovani'] : null,
+			$food,
+			(isset($data['jak_se_prihlasit']) && $data['jak_se_prihlasit'] !== '') ? $data['jak_se_prihlasit'] : null,
+			(isset($data['web']) && $data['web'] !== '') ? $data['web'] : null
+		);
+	}
+
+
+	/**
+	 * @return int
+	 */
+	public function getId()
+	{
+		return $this->id;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getCoverPhotoPath()
+	{
+		return $this->coverPhotoPath;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function hasCoverPhoto()
+	{
+		return $this->coverPhotoPath !== null;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getName()
+	{
+		return $this->name;
+	}
+
+	/**
+	 * @return \DateTimeImmutable
+	 */
+	public function getDateFrom()
+	{
+		return $this->dateFrom;
+	}
+
+	/**
+	 * @return \DateTimeImmutable
+	 */
+	public function getDateUntil()
+	{
+		return $this->dateUntil;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getType()
+	{
+		return $this->type;
+	}
+
+	/**
+	 * @return Program
+	 */
+	public function getProgram()
+	{
+		return $this->program;
+	}
+
+	/**
+	 * @return Place
+	 */
+	public function getPlace()
+	{
+		return $this->place;
+	}
+
+	/**
+	 * @return RegistrationType
+	 */
+	public function getRegistrationType()
+	{
+		return $this->registrationType;
+	}
+
+	/**
+	 * @return int|null
+	 */
+	public function getAgeFrom()
+	{
+		return $this->ageFrom;
+	}
+
+	/**
+	 * @return int|null
+	 */
+	public function getAgeUntil()
+	{
+		return $this->ageUntil;
+	}
+
+	/**
+	 * @return int|string
+	 */
+	public function getPrice()
+	{
+		return $this->price;
+	}
+
+	public function isPaid()
+	{
+		return $this->price !== 0;
+	}
+
+	/**
+	 * @return Organizer
+	 */
+	public function getOrganizer()
+	{
+		return $this->organizer;
+	}
+
+	/**
+	 * @return TargetGroup
+	 */
+	public function getTargetGroup()
+	{
+		return $this->targetGroup;
+	}
+
+	/**
+	 * @return Invitation|null
+	 */
+	public function getInvitation()
+	{
+		return $this->invitation;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function hasTimeFrom()
+	{
+		return $this->timeFrom !== null;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getTimeFrom()
+	{
+		return $this->timeFrom;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getProgramDescription()
+	{
+		return $this->programDescription;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getNotes()
+	{
+		return $this->notes;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function hasRelatedWebsite()
+	{
+		return $this->relatedWebsite !== null;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getRelatedWebsite()
+	{
+		return $this->relatedWebsite;
+	}
+
+
+	/**
+	 * Extracted from \Nette\Utils\Strings (v2.3)
+	 * Starts the $haystack string with the prefix $needle?
+	 * @param  string
+	 * @param  string
+	 * @return bool
+	 */
+	private static function startsWith($haystack, $needle)
+	{
+		return strncmp($haystack, $needle, strlen($needle)) === 0;
+	}
+
+}
diff --git a/src/Response/Event/Invitation/Food.php b/src/Response/Event/Invitation/Food.php
new file mode 100644
index 0000000..2f9cf0a
--- /dev/null
+++ b/src/Response/Event/Invitation/Food.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event\Invitation;
+
+
+final class Food
+{
+
+	/* private */ const CHOOSEABLE = 0;
+	/* private */ const VEGETARIAN = 1;
+	/* private */ const NON_VEGETARIAN = 2;
+
+
+	/** @var bool */
+	private $isListed = false;
+
+	/** @var bool */
+	private $isOfTypeChooseable = false;
+
+	/** @var bool */
+	private $isOfTypeVegetarian = false;
+
+	/** @var bool */
+	private $isOfTypeNonVegetarian = false;
+
+
+	/**
+	 * @param int|null $food
+	 */
+	private function __construct($food)
+	{
+		if (\in_array($food, [
+			self::CHOOSEABLE,
+			self::VEGETARIAN,
+			self::NON_VEGETARIAN,
+		], true)) {
+			$this->isListed = true;
+
+			$this->isOfTypeChooseable = $food === self::CHOOSEABLE;
+			$this->isOfTypeVegetarian = $food === self::VEGETARIAN;
+			$this->isOfTypeNonVegetarian = $food === self::NON_VEGETARIAN;
+		}
+	}
+
+	/**
+	 * @param int|null $food
+	 * @return self
+	 */
+	public static function from($food)
+	{
+		return new self($food);
+	}
+
+
+	/**
+	 * @return bool
+	 */
+	public function isListed()
+	{
+		return $this->isListed;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeChooseable()
+	{
+		return $this->isOfTypeChooseable;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeVegetarian()
+	{
+		return $this->isOfTypeVegetarian;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeNonVegetarian()
+	{
+		return $this->isOfTypeNonVegetarian;
+	}
+
+}
diff --git a/src/Response/Event/Invitation/Invitation.php b/src/Response/Event/Invitation/Invitation.php
new file mode 100644
index 0000000..b936b3c
--- /dev/null
+++ b/src/Response/Event/Invitation/Invitation.php
@@ -0,0 +1,185 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event\Invitation;
+
+
+final class Invitation
+{
+
+	/** @var string */
+	private $introduction;
+
+	/** @var string */
+	private $organizationalInformation;
+
+	/** @var string|null */
+	private $accommodation;
+
+	/** @var Food */
+	private $food;
+
+	/** @var string */
+	private $workDescription;
+
+	/** @var int|null */
+	private $workHoursPerDay;
+
+	/** @var Presentation|null */
+	private $presentation;
+
+
+	/**
+	 * @param string $introduction
+	 * @param string $organizationalInformation
+	 * @param string|null $accommodation
+	 * @param int|null $food
+	 * @param string $workDescription
+	 * @param int|null $workHoursPerDay
+	 * @param string|null $presentationText
+	 * @param string[] $presentationPhotos
+	 */
+	private function __construct(
+		$introduction,
+		$organizationalInformation = null,
+		$accommodation = null,
+		$food,
+		$workDescription,
+		$workHoursPerDay = null,
+		$presentationText = null,
+		array $presentationPhotos = []
+	) {
+		$this->introduction = $introduction;
+		$this->organizationalInformation = $organizationalInformation;
+
+		if ($accommodation !== null) {
+			$this->accommodation = $accommodation;
+		}
+
+		$this->food = Food::from($food);
+
+		$this->workDescription = $workDescription;
+
+		if ($workHoursPerDay !== null) {
+			$this->workHoursPerDay = $workHoursPerDay;
+		}
+
+		if ($presentationText !== null || \count($presentationPhotos) > 0) {
+			$this->presentation = Presentation::from($presentationText, $presentationPhotos);
+		}
+	}
+
+	/**
+	 * @param string $introduction
+	 * @param string $organizationalInformation
+	 * @param string|null $accommodation
+	 * @param int|null $food
+	 * @param string $workDescription
+	 * @param int|null $workHoursPerDay
+	 * @param string|null $presentationText
+	 * @param string[] $presentationPhotos
+	 * @return self
+	 */
+	public static function from(
+		$introduction,
+		$organizationalInformation,
+		$accommodation = null,
+		$food = null,
+		$workDescription,
+		$workHoursPerDay = null,
+		$presentationText = null,
+		array $presentationPhotos = []
+	) {
+		return new self(
+			$introduction,
+			$organizationalInformation,
+			$accommodation,
+			$food,
+			$workDescription,
+			$workHoursPerDay,
+			$presentationText,
+			$presentationPhotos
+		);
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function getIntroduction()
+	{
+		return $this->introduction;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getOrganizationalInformation()
+	{
+		return $this->organizationalInformation;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isAccommodationListed()
+	{
+		return $this->accommodation !== null;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getAccommodation()
+	{
+		return $this->accommodation;
+	}
+
+	/**
+	 * @return Food
+	 */
+	public function getFood()
+	{
+		return $this->food;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getWorkDescription()
+	{
+		return $this->workDescription;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function areWorkHoursPerDayListed()
+	{
+		return $this->workHoursPerDay !== null;
+	}
+
+	/**
+	 * @return int|null
+	 */
+	public function getWorkHoursPerDay()
+	{
+		return $this->workHoursPerDay;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function hasPresentation()
+	{
+		return $this->presentation !== null;
+	}
+
+	/**
+	 * @return Presentation|null
+	 */
+	public function getPresentation()
+	{
+		return $this->presentation;
+	}
+
+}
diff --git a/src/Response/Event/Invitation/Photo.php b/src/Response/Event/Invitation/Photo.php
new file mode 100644
index 0000000..ca9b745
--- /dev/null
+++ b/src/Response/Event/Invitation/Photo.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event\Invitation;
+
+
+final class Photo
+{
+
+	/** @var string */
+	private $path;
+
+
+	/**
+	 * @param $path
+	 */
+	private function __construct($path)
+	{
+		$this->path = $path;
+	}
+
+
+	/**
+	 * @param $path
+	 * @return self
+	 */
+	public static function from($path)
+	{
+		return new self($path);
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function getPath()
+	{
+		return $this->path;
+	}
+
+}
diff --git a/src/Response/Event/Invitation/Presentation.php b/src/Response/Event/Invitation/Presentation.php
new file mode 100644
index 0000000..f85a72c
--- /dev/null
+++ b/src/Response/Event/Invitation/Presentation.php
@@ -0,0 +1,103 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event\Invitation;
+
+
+final class Presentation
+{
+
+	/** @var string|null */
+	private $text;
+
+	/** @var bool */
+	private $hasAnyPhotos = false;
+
+	/** @var Photo[] */
+	private $photos = [];
+
+
+	/**
+	 * @param string|null $text
+	 * @param string[] $photoPaths
+	 */
+	private function __construct($text, array $photoPaths)
+	{
+		if ($text !== null) {
+			$this->text = $text;
+		}
+
+		if (\count($photoPaths) > 0) {
+			$this->addPhotos($photoPaths);
+		}
+	}
+
+
+	/**
+	 * @param string|null $text
+	 * @param string[] $photoPaths
+	 * @return self
+	 */
+	public static function from($text = null, array $photoPaths)
+	{
+		return new self($text, $photoPaths);
+	}
+
+	/**
+	 * @param string $photoPath
+	 * @return self
+	 */
+	private function addPhoto($photoPath)
+	{
+		$this->hasAnyPhotos = true;
+		$this->photos[] = Photo::from($photoPath);
+
+		return $this;
+	}
+
+	/**
+	 * @param string[] $photoPaths
+	 * @return self
+	 */
+	private function addPhotos(array $photoPaths)
+	{
+		foreach ($photoPaths as $photoPath) {
+			$this->addPhoto($photoPath);
+		}
+
+		return $this;
+	}
+
+
+	/**
+	 * @return bool
+	 */
+	public function hasText()
+	{
+		return $this->text !== null;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getText()
+	{
+		return $this->text;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function hasAnyPhotos()
+	{
+		return $this->hasAnyPhotos;
+	}
+
+	/**
+	 * @return Photo[]
+	 */
+	public function getPhotos()
+	{
+		return $this->photos;
+	}
+
+}
diff --git a/src/Response/Event/Organizer.php b/src/Response/Event/Organizer.php
new file mode 100644
index 0000000..ade2d0a
--- /dev/null
+++ b/src/Response/Event/Organizer.php
@@ -0,0 +1,142 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event;
+
+
+final class Organizer
+{
+
+	/** @var OrganizerOrganizationalUnit|null */
+	private $organizationalUnit;
+
+	/** @var string|null */
+	private $responsiblePerson;
+
+	/** @var string|null */
+	private $organizers;
+
+	/** @var string|null */
+	private $contactPersonName;
+
+	/** @var string */
+	private $contactPhone;
+
+	/** @var string */
+	private $contactEmail;
+
+
+	/**
+	 * @param int|null $organizationalUnitId
+	 * @param string|null $organizationalUnitName
+	 * @param string|null $responsiblePerson
+	 * @param string|null $organizers
+	 * @param string|null $contactPersonName
+	 * @param string $contactPhone
+	 * @param string $contactEmail
+	 */
+	private function __construct(
+		$organizationalUnitId = null,
+		$organizationalUnitName = null,
+		$responsiblePerson = null,
+		$organizers = null,
+		$contactPersonName = null,
+		$contactPhone,
+		$contactEmail
+	) {
+		$this->organizationalUnit = ($organizationalUnitId !== null && $organizationalUnitName !== null) ? OrganizerOrganizationalUnit::from($organizationalUnitId, $organizationalUnitName) : null;
+		$this->responsiblePerson = $responsiblePerson;
+		$this->organizers = $organizers;
+		$this->contactPersonName = $contactPersonName;
+		$this->contactPhone = $contactPhone;
+		$this->contactEmail = $contactEmail;
+	}
+
+	/**
+	 * @param int|null $organizationalUnitId
+	 * @param string|null $organizationalUnitName
+	 * @param string|null $responsiblePerson
+	 * @param string|null $organizers
+	 * @param string|null $contactPersonName
+	 * @param string $contactPhone
+	 * @param string $contactEmail
+	 *
+	 * @return self
+	 */
+	public static function from(
+		$organizationalUnitId = null,
+		$organizationalUnitName = null,
+		$responsiblePerson = null,
+		$organizers = null,
+		$contactPersonName = null,
+		$contactPhone,
+		$contactEmail
+	) {
+		return new self(
+			$organizationalUnitId,
+			$organizationalUnitName,
+			$responsiblePerson,
+			$organizers,
+			$contactPersonName,
+			$contactPhone,
+			$contactEmail
+		);
+	}
+
+
+	/**
+	 * @return OrganizerOrganizationalUnit|null
+	 */
+	public function getOrganizationalUnit()
+	{
+		return $this->organizationalUnit;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getResponsiblePerson()
+	{
+		return $this->responsiblePerson;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function areOrganizersListed()
+	{
+		return $this->organizers !== null;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getOrganizers()
+	{
+		return $this->organizers;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getContactPersonName()
+	{
+		return $this->contactPersonName;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getContactPhone()
+	{
+		return $this->contactPhone;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getContactEmail()
+	{
+		return $this->contactEmail;
+	}
+
+}
diff --git a/src/Response/OrganizerOrganizationalUnit.php b/src/Response/Event/OrganizerOrganizationalUnit.php
similarity index 63%
rename from src/Response/OrganizerOrganizationalUnit.php
rename to src/Response/Event/OrganizerOrganizationalUnit.php
index ae6a3e2..e36ec14 100644
--- a/src/Response/OrganizerOrganizationalUnit.php
+++ b/src/Response/Event/OrganizerOrganizationalUnit.php
@@ -1,10 +1,10 @@
 <?php
 
-namespace HnutiBrontosaurus\BisApiClient\Response;
+namespace HnutiBrontosaurus\BisApiClient\Response\Event;
 
 
 /**
- * This could be OrganizationalUnit instead as well, but one more request per each event would be generated which is kinda wasteful. And Brontosaurus does not want any more waste...
+ * This could be OrganizationalUnit instead as well, but one more request per each event would be generated which is kinda wasteful. And Brontosaurus does not want any more waste... :-)
  */
 final class OrganizerOrganizationalUnit
 {
@@ -20,12 +20,22 @@ final class OrganizerOrganizationalUnit
 	 * @param int $id
 	 * @param string $name
 	 */
-	public function __construct($id, $name)
+	private function __construct($id, $name)
 	{
 		$this->id = $id;
 		$this->name = $name;
 	}
 
+	/**
+	 * @param int $id
+	 * @param string $name
+	 * @return self
+	 */
+	public static function from($id, $name)
+	{
+		return new self($id, $name);
+	}
+
 
 	/**
 	 * @return int
diff --git a/src/Response/Event/Place.php b/src/Response/Event/Place.php
new file mode 100644
index 0000000..efa4682
--- /dev/null
+++ b/src/Response/Event/Place.php
@@ -0,0 +1,75 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event;
+
+
+final class Place
+{
+
+	/** @var string */
+	private $name;
+
+	/**
+	 * In format `49.132456 16.123456`.
+	 * @var string|null
+	 */
+	private $coordinates;
+
+
+	/**
+	 * @param string $name
+	 * @param string|null $alternativeName
+	 * @param string|null $coordinates
+	 */
+	private function __construct(
+		$name,
+		$alternativeName = null,
+		$coordinates = null
+	) {
+		$this->name = $alternativeName !== null ? $alternativeName : $name; // It looks like alternative names are more concrete.
+
+		if ($coordinates !== null && \preg_match('|[0-9]+(\.[0-9]+) [0-9]+(\.[0-9]+)|', $coordinates)) { // Only `49.132456 16.123456` format is used by users right now.
+			$this->coordinates = $coordinates;
+		}
+	}
+
+	/**
+	 * @param string $name
+	 * @param string|null $alternativeName
+	 * @param string|null $coordinates
+	 * @return self
+	 */
+	public static function from(
+		$name,
+		$alternativeName = null,
+		$coordinates = null
+	) {
+		return new self($name, $alternativeName, $coordinates);
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function getName()
+	{
+		return $this->name;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function areCoordinatesListed()
+	{
+		return $this->coordinates !== null;
+	}
+
+	/**
+	 * @return string|null
+	 */
+	public function getCoordinates()
+	{
+		return $this->coordinates;
+	}
+
+}
diff --git a/src/Response/Event/Program.php b/src/Response/Event/Program.php
new file mode 100644
index 0000000..91b7c83
--- /dev/null
+++ b/src/Response/Event/Program.php
@@ -0,0 +1,141 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event;
+
+use HnutiBrontosaurus\BisApiClient\InvalidArgumentException;
+
+
+final class Program
+{
+
+	const PROGRAM_NONE = 'none';
+	const PROGRAM_NATURE = 'ap';
+	const PROGRAM_SIGHTS = 'pamatky';
+	const PROGRAM_BRDO = 'brdo';
+	const PROGRAM_EKOSTAN = 'ekostan';
+	const PROGRAM_PSB = 'psb';
+	const PROGRAM_EDUCATION = 'vzdelavani';
+
+
+	/** @var string */
+	private $slug;
+
+	/** @var string|null */
+	private $name;
+
+
+	/**
+	 * @param string|null $slug
+	 * @param string|null $name
+	 * @throws InvalidArgumentException
+	 */
+	private function __construct($slug = null, $name = null)
+	{
+		if ($slug === null) {
+			$slug = self::PROGRAM_NONE;
+		}
+
+		if ( ! \in_array($slug, [
+			self::PROGRAM_NONE,
+			self::PROGRAM_NATURE,
+			self::PROGRAM_SIGHTS,
+			self::PROGRAM_BRDO,
+			self::PROGRAM_EKOSTAN,
+			self::PROGRAM_PSB,
+			self::PROGRAM_EDUCATION,
+		], true)) {
+			$slug = self::PROGRAM_NONE;
+		}
+
+		$this->slug = $slug;
+
+		if ($name !== null) {
+			$this->name = $name;
+		}
+	}
+
+	/**
+	 * @param string|null $slug
+	 * @param string|null $name
+	 * @return self
+	 */
+	public static function from($slug = null, $name = null)
+	{
+		return new self($slug, $name);
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function getSlug()
+	{
+		return $this->slug;
+	}
+
+	/**
+	 * @return string
+	 */
+	public function getName()
+	{
+		return $this->name;
+	}
+
+
+	/**
+	 * @return bool
+	 */
+	public function isNotSelected()
+	{
+		return $this->slug === self::PROGRAM_NONE;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeNature()
+	{
+		return $this->slug === self::PROGRAM_NATURE;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeSights()
+	{
+		return $this->slug === self::PROGRAM_SIGHTS;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeBrdo()
+	{
+		return $this->slug === self::PROGRAM_BRDO;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeEkostan()
+	{
+		return $this->slug === self::PROGRAM_EKOSTAN;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypePsb()
+	{
+		return $this->slug === self::PROGRAM_PSB;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeEducation()
+	{
+		return $this->slug === self::PROGRAM_EDUCATION;
+	}
+
+}
diff --git a/src/Response/Event/Registration/RegistrationQuestion.php b/src/Response/Event/Registration/RegistrationQuestion.php
new file mode 100644
index 0000000..4125336
--- /dev/null
+++ b/src/Response/Event/Registration/RegistrationQuestion.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event\Registration;
+
+
+final class RegistrationQuestion
+{
+
+	/** @var string */
+	private $question;
+
+
+	/**
+	 * @param string $question
+	 */
+	private function __construct($question)
+	{
+		$this->question = $question;
+	}
+
+	/**
+	 * @param string $question
+	 * @return self
+	 */
+	public static function from($question)
+	{
+		return new self($question);
+	}
+
+
+	/**
+	 * @return string
+	 */
+	public function toString()
+	{
+		return $this->__toString();
+	}
+
+	/**
+	 * @return string
+	 */
+	public function __toString()
+	{
+		return $this->question;
+	}
+
+}
diff --git a/src/Response/Event/Registration/RegistrationType.php b/src/Response/Event/Registration/RegistrationType.php
new file mode 100644
index 0000000..4463dec
--- /dev/null
+++ b/src/Response/Event/Registration/RegistrationType.php
@@ -0,0 +1,199 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event\Registration;
+
+use HnutiBrontosaurus\BisApiClient\BadUsageException;
+use HnutiBrontosaurus\BisApiClient\Response\RegistrationTypeException;
+
+
+final class RegistrationType
+{
+
+	const TYPE_VIA_BRONTOWEB = 1;
+	const TYPE_VIA_EMAIL = 2;
+	const TYPE_VIA_CUSTOM_WEBPAGE = 3;
+	const TYPE_NONE = 4;
+	const TYPE_DISABLED = 5;
+
+
+	/** @var int One of above constant values. */
+	private $type;
+
+	/** @var RegistrationQuestion[] In case of registering via Brontoweb. */
+	private $questions = [];
+
+	/** @var string|null In case of registering via e-mail. */
+	private $email;
+
+	/** @var string|null In case of registering via custom webpage. */
+	private $url;
+
+	/** @var bool */
+	private $hasValidData = true;
+
+
+	/**
+	 * @param int $type
+	 * @param array|null $questions
+	 * @param string|null $email
+	 * @param string|null $url
+	 */
+	private function __construct($type, array $questions = null, $email = null, $url = null)
+	{
+		if ( ! \in_array($type, [
+			self::TYPE_VIA_BRONTOWEB,
+			self::TYPE_VIA_EMAIL,
+			self::TYPE_VIA_CUSTOM_WEBPAGE,
+			self::TYPE_NONE,
+		], true)) {
+			$type = self::TYPE_DISABLED; // silent fallback
+		}
+
+		$this->type = $type;
+
+		if ($type === self::TYPE_VIA_BRONTOWEB && $questions !== null && \count($questions) > 0) {
+			$this->questions = \array_map(function ($question) {
+				return RegistrationQuestion::from($question);
+			}, $questions);
+		}
+
+		if ($type === self::TYPE_VIA_EMAIL) {
+			if ($email === null) {
+				$this->hasValidData = false;
+			}
+
+			$this->email = $email;
+		}
+
+		if ($type === self::TYPE_VIA_CUSTOM_WEBPAGE) {
+			if ($url === null) {
+				$this->hasValidData = false;
+			}
+
+			$this->url = $url;
+		}
+	}
+
+	/**
+	 * @param int $type
+	 * @param array|null $questions
+	 * @param string|null $email
+	 * @param string|null $url
+	 * @return self
+	 */
+	public static function from($type, array $questions = null, $email = null, $url = null)
+	{
+		return new self($type, $questions, $email, $url);
+	}
+
+
+	// registration via Brontoweb
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeBrontoWeb()
+	{
+		return $this->type === self::TYPE_VIA_BRONTOWEB;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function areAnyQuestions()
+	{
+		return \count($this->questions) > 0;
+	}
+
+	/**
+	 * @return RegistrationQuestion[]
+	 */
+	public function getQuestions()
+	{
+		return $this->questions;
+	}
+
+
+	// registration via e-mail
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeEmail()
+	{
+		return $this->type === self::TYPE_VIA_EMAIL;
+	}
+
+	/**
+	 * @return string|null
+	 * @throws RegistrationTypeException
+	 * @throws BadUsageException
+	 */
+	public function getEmail()
+	{
+		if ( ! $this->hasValidData()) {
+			throw RegistrationTypeException::missingAdditionalData('email', $this->type);
+		}
+
+		if ( ! $this->isOfTypeEmail()) {
+			throw new BadUsageException('This method can not be called when the registration is not of `via e-mail` type.');
+		}
+
+		return $this->email;
+	}
+
+
+	// registration via custom webpage
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeCustomWebpage()
+	{
+		return $this->type === self::TYPE_VIA_CUSTOM_WEBPAGE;
+	}
+
+	/**
+	 * @return string|null
+	 * @throws RegistrationTypeException
+	 * @throws BadUsageException
+	 */
+	public function getUrl()
+	{
+		if ( ! $this->hasValidData()) {
+			throw RegistrationTypeException::missingAdditionalData('url', $this->type);
+		}
+
+		if ( ! $this->isOfTypeCustomWebpage()) {
+			throw new BadUsageException('This method can not be called when the registration is not of `via custom webpage` type.');
+		}
+
+		return $this->url;
+	}
+
+
+	// no registration needed
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeNone()
+	{
+		return $this->type === self::TYPE_NONE;
+	}
+
+
+	// registration disabled
+
+	public function isOfTypeDisabled()
+	{
+		return $this->type === self::TYPE_DISABLED;
+	}
+
+
+	public function hasValidData()
+	{
+		return $this->hasValidData;
+	}
+
+}
diff --git a/src/Response/Event/TargetGroup.php b/src/Response/Event/TargetGroup.php
new file mode 100644
index 0000000..8cb76a3
--- /dev/null
+++ b/src/Response/Event/TargetGroup.php
@@ -0,0 +1,90 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\Event;
+
+use HnutiBrontosaurus\BisApiClient\InvalidArgumentException;
+
+
+final class TargetGroup
+{
+
+	const EVERYONE = 1;
+	const ADULTS = 2;
+	const CHILDREN = 3;
+	const FAMILIES = 4;
+	const FIRST_TIME_ATTENDEES = 5;
+
+
+	/** @var int */
+	private $id;
+
+
+	/**
+	 * @param int $id
+	 */
+	private function __construct($id)
+	{
+		if ( ! \in_array($id, [
+			self::EVERYONE,
+			self::ADULTS,
+			self::CHILDREN,
+			self::FAMILIES,
+			self::FIRST_TIME_ATTENDEES,
+		], true)) {
+			throw new InvalidArgumentException('Value `' . $id . '` is not of valid types for `id` parameter.');
+		}
+
+		$this->id = $id;
+	}
+
+	/**
+	 * @param int $id
+	 * @return self
+	 */
+	public static function from($id)
+	{
+		return new self($id);
+	}
+
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeEveryone()
+	{
+		return $this->id === self::EVERYONE;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeAdults()
+	{
+		return $this->id === self::ADULTS;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeChildren()
+	{
+		return $this->id === self::CHILDREN;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeFamilies()
+	{
+		return $this->id === self::FAMILIES;
+	}
+
+	/**
+	 * @return bool
+	 */
+	public function isOfTypeFirstTimeAttendees()
+	{
+		return $this->id === self::FIRST_TIME_ATTENDEES;
+	}
+
+}
diff --git a/src/Response/OrganizationalUnit.php b/src/Response/OrganizationalUnit/OrganizationalUnit.php
similarity index 69%
rename from src/Response/OrganizationalUnit.php
rename to src/Response/OrganizationalUnit/OrganizationalUnit.php
index 04f1fdf..cb0e428 100644
--- a/src/Response/OrganizationalUnit.php
+++ b/src/Response/OrganizationalUnit/OrganizationalUnit.php
@@ -1,8 +1,6 @@
 <?php
 
-namespace HnutiBrontosaurus\BisApiClient\Response;
-
-use HnutiBrontosaurus\BisApiClient\InvalidArgumentException;
+namespace HnutiBrontosaurus\BisApiClient\Response\OrganizationalUnit;
 
 
 final class OrganizationalUnit
@@ -29,22 +27,22 @@ final class OrganizationalUnit
 	/** @var string */
 	private $postCode;
 
-	/** @var string|NULL */
+	/** @var string|null */
 	private $phone;
 
-	/** @var string|NULL */
+	/** @var string|null */
 	private $email;
 
-	/** @var string|NULL */
+	/** @var string|null */
 	private $website;
 
 	/** @var int */
 	private $type;
 
-	/** @var string|NULL */
+	/** @var string|null */
 	private $chairman;
 
-	/** @var string|NULL */
+	/** @var string|null */
 	private $manager;
 
 
@@ -54,25 +52,25 @@ final class OrganizationalUnit
 	 * @param string $street
 	 * @param string $city
 	 * @param string $postCode
-	 * @param string|NULL $phone
-	 * @param string|NULL $email
-	 * @param string|NULL $website
+	 * @param string|null $phone
+	 * @param string|null $email
+	 * @param string|null $website
 	 * @param int $type
-	 * @param string|NULL $chairman
-	 * @param string|NULL $manager
+	 * @param string|null $chairman
+	 * @param string|null $manager
 	 */
-	public function __construct(
+	private function __construct(
 		$id,
 		$name,
 		$street,
 		$city,
 		$postCode,
-		$phone = NULL,
-		$email = NULL,
-		$website = NULL,
+		$phone = null,
+		$email = null,
+		$website = null,
 		$type,
-		$chairman = NULL,
-		$manager = NULL
+		$chairman = null,
+		$manager = null
 	) {
 		$this->id = $id;
 		$this->name = $name;
@@ -90,8 +88,8 @@ public function __construct(
 			self::TYPE_BASE,
 			self::TYPE_REGIONAL,
 			self::TYPE_OFFICE,
-		], TRUE)) {
-			throw new InvalidArgumentException('Type `' . $type . '` is not of valid types.');
+		], true)) {
+			throw new UnknownOrganizationUnitTypeException('Type `' . $type . '` is not of valid types.');
 		}
 		$this->type = $type;
 	}
@@ -105,12 +103,12 @@ public static function fromResponseData(array $data)
 			$data['ulice'],
 			$data['mesto'],
 			$data['psc'],
-			$data['telefon'] !== '' ? $data['telefon'] : NULL,
-			$data['email'] !== '' ? $data['email'] : NULL,
-			$data['www'] !== '' ? $data['www'] : NULL,
+			(isset($data['telefon']) && $data['telefon'] !== '') ? $data['telefon'] : null,
+			(isset($data['email']) && $data['email'] !== '') ? $data['email'] : null,
+			(isset($data['www']) && $data['www'] !== '') ? $data['www'] : null,
 			(int) $data['uroven'],
-			$data['predseda'] !== '' ? $data['predseda'] : NULL,
-			$data['hospodar'] !== '' ? $data['hospodar'] : NULL
+			(isset($data['predseda']) && $data['predseda'] !== '') ? $data['predseda'] : null,
+			(isset($data['hospodar']) && $data['hospodar'] !== '') ? $data['hospodar'] : null
 		);
 	}
 
@@ -156,7 +154,7 @@ public function getPostCode()
 	}
 
 	/**
-	 * @return string|NULL
+	 * @return string|null
 	 */
 	public function getPhone()
 	{
@@ -164,7 +162,7 @@ public function getPhone()
 	}
 
 	/**
-	 * @return string|NULL
+	 * @return string|null
 	 */
 	public function getEmail()
 	{
@@ -172,7 +170,7 @@ public function getEmail()
 	}
 
 	/**
-	 * @return string|NULL
+	 * @return string|null
 	 */
 	public function getWebsite()
 	{
@@ -188,7 +186,7 @@ public function getType()
 	}
 
 	/**
-	 * @return string|NULL
+	 * @return string|null
 	 */
 	public function getChairman()
 	{
@@ -196,7 +194,7 @@ public function getChairman()
 	}
 
 	/**
-	 * @return string|NULL
+	 * @return string|null
 	 */
 	public function getManager()
 	{
diff --git a/src/Response/OrganizationalUnit/exceptions.php b/src/Response/OrganizationalUnit/exceptions.php
new file mode 100644
index 0000000..ba73fa9
--- /dev/null
+++ b/src/Response/OrganizationalUnit/exceptions.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response\OrganizationalUnit;
+
+
+final class UnknownOrganizationUnitTypeException extends \RuntimeException
+{}
diff --git a/src/Response/Organizer.php b/src/Response/Organizer.php
deleted file mode 100644
index 51480e5..0000000
--- a/src/Response/Organizer.php
+++ /dev/null
@@ -1,116 +0,0 @@
-<?php
-
-namespace HnutiBrontosaurus\BisApiClient\Response;
-
-
-final class Organizer
-{
-
-	/** @var OrganizerOrganizationalUnit|NULL */
-	private $organizationalUnit;
-
-	/** @var string|NULL */
-	private $responsiblePerson;
-
-	/** @var string|NULL */
-	private $organizers;
-
-	/** @var string|NULL */
-	private $contactPersonName;
-
-	/** @var string */
-	private $contactPhone;
-
-	/** @var string */
-	private $contactEmail;
-
-	/** @var string|NULL */
-	private $contactWebsite;
-
-
-	/**
-	 * @param OrganizerOrganizationalUnit|NULL $organizationalUnit
-	 * @param string|NULL $responsiblePerson
-	 * @param string|NULL $organizers
-	 * @param string|NULL $contactPersonName
-	 * @param string $contactPhone
-	 * @param string $contactEmail
-	 * @param string|NULL $contactWebsite
-	 */
-	public function __construct(
-		OrganizerOrganizationalUnit $organizationalUnit = NULL,
-		$responsiblePerson = NULL,
-		$organizers = NULL,
-		$contactPersonName = NULL,
-		$contactPhone,
-		$contactEmail,
-		$contactWebsite = NULL
-	)
-	{
-		$this->organizationalUnit = $organizationalUnit;
-		$this->responsiblePerson = $responsiblePerson;
-		$this->organizers = $organizers;
-		$this->contactPersonName = $contactPersonName;
-		$this->contactPhone = $contactPhone;
-		$this->contactEmail = $contactEmail;
-		$this->contactWebsite = $contactWebsite;
-	}
-
-
-	/**
-	 * @return OrganizerOrganizationalUnit|NULL
-	 */
-	public function getOrganizationalUnit()
-	{
-		return $this->organizationalUnit;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getResponsiblePerson()
-	{
-		return $this->responsiblePerson;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getOrganizers()
-	{
-		return $this->organizers;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getContactPersonName()
-	{
-		return $this->contactPersonName;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getContactPhone()
-	{
-		return $this->contactPhone;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getContactEmail()
-	{
-		return $this->contactEmail;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getContactWebsite()
-	{
-		return $this->contactWebsite;
-	}
-
-}
diff --git a/src/Response/Place.php b/src/Response/Place.php
deleted file mode 100644
index 7b6dc1c..0000000
--- a/src/Response/Place.php
+++ /dev/null
@@ -1,73 +0,0 @@
-<?php
-
-namespace HnutiBrontosaurus\BisApiClient\Response;
-
-
-final class Place
-{
-
-	/** @var int|NULL */
-	private $id;
-
-	/** @var string */
-	private $name;
-
-	/** @var string|NULL */
-	private $mapLink;
-
-	/** @var string|NULL */
-	private $coords;
-
-
-	/**
-	 * @param int|NULL $id
-	 * @param string $name
-	 * @param string|NULL $mapLinkOrCoords Map hypertext link or coordinates depending on what user has filled in BIS.
-	 */
-	public function __construct($id = NULL, $name, $mapLinkOrCoords = NULL)
-	{
-		$this->id = $id;
-		$this->name = $name;
-
-		if (\strncmp($mapLinkOrCoords, 'http', \strlen('http')) === 0) { // Copied from `Nette\Utils\Strings::startsWith()`.
-			$this->mapLink = $mapLinkOrCoords;
-		}
-		elseif (\preg_match('|[0-9]+(\.[0-9]+)N, [0-9]+(\.[0-9]+)E|', $mapLinkOrCoords)) { // Only `49.132456N, 16.123456E` format is used by users right now.
-			$this->coords = $mapLinkOrCoords;
-		}
-	}
-
-
-	/**
-	 * @return int|NULL
-	 */
-	public function getId()
-	{
-		return $this->id;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getName()
-	{
-		return $this->name;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getMapLink()
-	{
-		return $this->mapLink;
-	}
-
-	/**
-	 * @return string|NULL
-	 */
-	public function getCoords()
-	{
-		return $this->coords;
-	}
-
-}
diff --git a/src/Response/Program.php b/src/Response/Program.php
deleted file mode 100644
index c3f13e5..0000000
--- a/src/Response/Program.php
+++ /dev/null
@@ -1,81 +0,0 @@
-<?php
-
-namespace HnutiBrontosaurus\BisApiClient\Response;
-
-use HnutiBrontosaurus\BisApiClient\InvalidArgumentException;
-
-
-final class Program
-{
-
-	const PROGRAM_NATURE = 'ap';
-	const PROGRAM_SIGHTS = 'pamatky';
-	const PROGRAM_BRDO = 'brdo';
-	const PROGRAM_EKOSTAN = 'ekostan';
-	const PROGRAM_PSB = 'psb';
-	const PROGRAM_EDUCATION = 'vzdelavani';
-
-
-	/** @var string */
-	private $slug;
-
-	/** @var string */
-	private $name;
-
-
-	/**
-	 * @param string $slug
-	 * @param string $name
-	 */
-	public function __construct($slug, $name)
-	{
-		if (!\in_array($slug, [
-			self::PROGRAM_NATURE,
-			self::PROGRAM_SIGHTS,
-			self::PROGRAM_BRDO,
-			self::PROGRAM_EKOSTAN,
-			self::PROGRAM_PSB,
-			self::PROGRAM_EDUCATION,
-		], TRUE)) {
-			throw new InvalidArgumentException('Value `' . $slug . '` is not of valid types for `slug` parameter.');
-		}
-
-		$this->slug = $slug;
-		$this->name = $name;
-	}
-
-
-	/**
-	 * @return string
-	 */
-	public function getSlug()
-	{
-		return $this->slug;
-	}
-
-	/**
-	 * @return string
-	 */
-	public function getName()
-	{
-		return $this->name;
-	}
-
-
-	/**
-	 * @return bool
-	 */
-	public function isOfTypeNature()
-	{
-		return $this->slug === self::PROGRAM_NATURE;
-	}
-
-	/**
-	 * @return bool
-	 */
-	public function isOfTypeSights()
-	{
-		return $this->slug === self::PROGRAM_SIGHTS;
-	}
-
-}
diff --git a/src/Response/RegistrationQuestion.php b/src/Response/RegistrationQuestion.php
deleted file mode 100644
index eb2e3d9..0000000
--- a/src/Response/RegistrationQuestion.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-namespace HnutiBrontosaurus\BisApiClient\Response;
-
-
-final class RegistrationQuestion
-{
-
-	/** @var string */
-	private $question;
-
-
-	/**
-	 * @param string $question
-	 */
-	public function __construct($question)
-	{
-		$this->question = $question;
-	}
-
-
-	/**
-	 * @return string
-	 */
-	public function getQuestion()
-	{
-		return $this->question;
-	}
-
-}
diff --git a/src/Response/Response.php b/src/Response/Response.php
index ae5df08..9a2166e 100644
--- a/src/Response/Response.php
+++ b/src/Response/Response.php
@@ -10,6 +10,7 @@ final class Response
 
 	const TAG_RESULT = 'result';
 	const TAG_RESULT_ATTRIBUTE_ERROR = 'error';
+	const TAG_ATTRIBUTE_ID = 'id';
 
 
 	/** @var ResponseInterface */
@@ -37,13 +38,18 @@ private function parseDom(\DOMDocument $domDocument)
 		$rowNodeList = $domFinder->query('*', $domDocument->getElementsByTagName(self::TAG_RESULT)->item(0));
 
 		foreach ($rowNodeList as $rowNode) {
-			\assert($rowNode instanceof \DOMNode);
+			\assert($rowNode instanceof \DOMElement);
 
+			/** @var array $row */
 			$row = [];
 			foreach ($domFinder->query('*', $rowNode) as $node) {
-				\assert($node instanceof \DOMNode);
+				\assert($node instanceof \DOMElement);
 
-				$row[$node->nodeName] = $node->nodeValue;
+				// if there is an ID attribute, use this one a the value as it is numeric representation (thus more technically reliable) of element's content
+				$row[$node->nodeName] = $node->hasAttribute(self::TAG_ATTRIBUTE_ID) ?
+					$node->getAttribute(self::TAG_ATTRIBUTE_ID)
+					:
+					$node->nodeValue;
 			}
 
 			$this->data[] = $row;
diff --git a/src/Response/exceptions.php b/src/Response/exceptions.php
new file mode 100644
index 0000000..57904d0
--- /dev/null
+++ b/src/Response/exceptions.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace HnutiBrontosaurus\BisApiClient\Response;
+
+use HnutiBrontosaurus\BisApiClient\BisApiClientRuntimeException;
+
+
+abstract class ResponseErrorException extends BisApiClientRuntimeException
+{}
+
+
+// invalid data structure
+
+final class InvalidContentTypeException extends ResponseErrorException
+{}
+
+final class InvalidXMLStructureException extends ResponseErrorException
+{}
+
+
+// invalid data values
+
+final class InvalidParametersException extends ResponseErrorException
+{}
+
+final class InvalidUserInputException extends ResponseErrorException
+{
+
+	/**
+	 * @param \DOMElement $element
+	 */
+	public function __construct(\DOMElement $element)
+	{
+		parent::__construct($element->nodeValue);
+	}
+
+}
+
+final class UnauthorizedAccessException extends ResponseErrorException
+{
+
+	public function __construct()
+	{
+		parent::__construct('You are not authorized to make such request with given credentials. Or you have simply wrong credentials. :-)');
+	}
+
+}
+
+final class UnknownErrorException extends ResponseErrorException
+{
+
+	/**
+	 * @param string $unknownErrorTypeKey
+	 */
+	public function __construct($unknownErrorTypeKey)
+	{
+		parent::__construct('Unknown error. Error type returned from BIS: ' . $unknownErrorTypeKey);
+	}
+
+}
+
+final class RegistrationTypeException extends ResponseErrorException
+{
+
+	public static function missingAdditionalData($key, $type)
+	{
+		return new self(\sprintf('Missing additional data `%s` for selected type %d.', $key, $type));
+	}
+
+}
diff --git a/src/exceptions.php b/src/exceptions.php
index 7ed4155..b3f1665 100644
--- a/src/exceptions.php
+++ b/src/exceptions.php
@@ -3,11 +3,31 @@
 namespace HnutiBrontosaurus\BisApiClient;
 
 
-class InvalidArgumentException extends \InvalidArgumentException
+// overall exceptions
+
+abstract class BisApiClientLogicException extends \LogicException
+{}
+
+abstract class BisApiClientRuntimeException extends \RuntimeException
+{}
+
+
+// working with API exceptions
+
+final class InvalidArgumentException extends BisApiClientLogicException
+{}
+
+final class BadUsageException extends BisApiClientLogicException
+{}
+
+
+// communicating with BIS exceptions
+
+abstract class ConnectionException extends BisApiClientRuntimeException
 {}
 
-class ResourceNotFoundException extends \RuntimeException
+final class TransferErrorException extends ConnectionException
 {}
 
-class BisClientException extends \RuntimeException
+final class NotFoundException extends ConnectionException
 {}