I think categorization of events does work with the pavilion plugin: Events Plugin 📆
I’ve never seen it work with the official calendar plugin, which had some event functionality added a few years ago.
[calendar] is meant to display the [date] s of its topic, that’s why the option category calendar asks for a postId.
[event] s of the whole site are only displayed in the calendar of the route upcoming-events (which is also make with the js lib fullcalendar, as the calendar ones )
edit: my bad, never seen this one: