Update to make utility script easier

[nimbinatus]

These two changes would be helpful.

Additionally, I would like to suggest two improvements to prevent this from happening in the future:

1. Add a line about the utility scripts to the CONTRIBUTING.md file to make them more discoverable for new contributors.
2. Add a check to the create_new_event.sh script to validate whether an event's folder already exists. If it does, the script should exit with a clear error message instead of creating a new subdirectory.
   Please let me know if these changes sound good. I can create the related issues if you agree.

Originally posted by @edupr91 in #15384 (comment)