If they are true custom taxonomies in WordPress for the Categories, then they would already appear just like tags do.
I’ll have to investigate but its possible that they aren’t using built in WP type systems for that in which case it would require custom rules to be added for TEC specifically.
@jellebuelens – I spent a good part of this past week trying to solve this, unfortunately we can filter event post type queries, but TEC also uses a custom events table, which is what they actually query for the event calendars & lists.
From going through the code I have not found any ways to filter those results appropriately using our mechanisms.
I’ve submitted a support ticket to hopefully get some insights, but no luck so far and I honestly can’t spend any more time on it, already reviewed their code in near entirity concerning the DB layers and there was no sign of a way to do what is needed currently. Hopefully they can provide an assist.
