Hi There!
Thanks for getting in touch with us!
We apologize for a bit of delay in getting back to you. We are dealing with a high volume of threads at the moment and we are slowly getting back to normal response times.
Unfortunately, the [tribe_events] shortcode does not allow multiple categories for the “category” attribute. This is the same for the [tribe_events_list] shortcode.
I know some users accomplish what you are looking for by creating a parent Event Category for multiple subcategories and then use it in the shortcode.
I hope that helps. Let me know if any follow up questions. 🙂
Best,
Victor