Now that calendar events can have individual colours, (THANK YOU! <3) I would love to be able to set keywords at a calendar level that automatically set an event's colour.

For example my calendar's default colour is yellow, but if I create an event that starts with "Work:" it automatically updates to a different colour.

This is something that GCal et al don't offer (as far as I know) and I think it would be a good feature.