I’m aware the functionality doesn’t exist today, but would love to request this feature and of course gauge the interest of the active community on this as well. It would be incredible to be able to have events colored by either the event category or tag.
When I suggested moving away from a third-party event application to a Discourse-integrated solution for my community, I was asked to keep a color-per-tag feature.
It was not available, either in Discourse Calendar or in Pavilion’s Events plugin, which I modified a bit as a proof of concept to add this feature in an ugly, hard-coded way: Events Plugin 📆 - #699 by Canapin.
I ended up not using any of them for several reasons, the missing color feature being one of them.