Cache API data

[goranche]

now that there are more events in the database, the delay until data from the API is available is becoming quite obvious. as this data doesn't change very often, a caching mechanism should improve this issue.

something to do on wednesday, I guess... 👼

[jurecuhalev]

I'll look into. Maybe using this: https://chibisov.github.io/drf-extensions/docs/#caching (or just using built-in django caching).

[goranche]

so will I 👅