Allow per-event colours for calendars
Feature summary
Proprietary and open-source calendar services allow users to select colours for each event. This is a week in my Nextcloud calendar's web interface:
And this is that same week from the same calendar, as seen in Gnome Calendar:
Both are modern, attractive interfaces. But the option to set a per-event colour (and have those colours sync with the online service) significantly improves calendar legibility by distinguishing more clearly between event types.
How would you like it to work
Implementing this feature would not negatively impact users who prefer per-calendar colours: the current option to pick a colour could become an option to pick a default colour, which would be applied unless overridden by user choice (either in Gnome Calendar or the user's online calendar service)