Hi!
Don't hesitate to use the Pro ticket support when a valid Pro subscription
(it's faster, and advanced support).
Do you have tested by using the feature icons ?
Or is it because it's in backend events list that you need a filter to check participants group ?
Best Regards,
Cyril
(yes multiple cat for one event is in the roadmap, but not yet a plan for this development, as currently working hard to finish this Summer the full refactory, and thanks to that, to introduce full of new features (frontend filtering, more custom fields types, paypal payment (pro version)... So full of things already in process!)