User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36
Steps to reproduce:
Suggest applying Category colors for event background instead of the Calendar color(s).
Apply category color to event backgrounds - Colors the background of an event with the associated Category color instead of the owning Calendar color.
Most users have numerous different Categories (with different colors) and only one or just a few Calendars. It makes more sense to color the events with the Category color, not the Calendar color for greatly improved functionality and to improve usability.
Suggest that the Calendar color is reversed with the Category color for events.
Events would be colored with the Category color with the small tip end of the event bar colors with the Calendar's color.
This was a sensible and popular feature in the 'Calendar Tweaks' add-on, which the developer has abandoned.
Note: The attached image only shows the Today pane (using Calendar Tweaks add-on to reverse the Calendar color with the Category colors), but it should provide you with the understanding for what I'm suggesting.