I ended up not using the About-Topic calendar, because the easy way to create an event is always 1st post of a topic and you’d be using that for calendar anyway not events.
I was able to edit 1st post of existing topics in sub-categories, then the sub-categories’ colour showed in the parent category’s displayed calendar.
Also, you mentioned theme component, which suggests adjustability; the calendar i’m talking about, the one implemented by the Events Calendar Categories admin setting, i would like to be able to adjust:
- The size of calendar on desktop site, the mobile site looks ok
- The day the week starts
I’m not listing too many things here because i don’t want to put people off, i imagine there were development problems that meant there needed to be different ways for a superuser to implement discourse-calendar