While tooling with the short, discovered that choosing a single category works, but no multiple categories.
Doesn’t work:
[tribe_events view=”map” categories=”pro-haunt-single-maze-or-attraction, multiple-mazes”]
Works:
[tribe_events view=”map” category=”multiple-mazes”]
(and I found the multiple threads about showing the filter bar using the short code, so no need to respond to that followup query).