Looking for Best Way to Display Events Targeting Specific Audiences

I am looking for the best way to display events targeting specific audiences.  The goal is to add an event on a main page and based on the category assigned, have it filter down to other pages based on that category.  The issue is sometimes the event affects more than one category.  I would like to use the Event web part; however, it will only allow you to assign 1 category per event and the web part will only allow you to assign 1 category to receive into the web part.  We are not able to use audience targeting at this time due set up.  When going into the list settings for the Event calendar, it gives an option to change the category to “checkboxes (allow multiple selections)” which is exactly what I need.  When I choose this and try to add an event, I get an error. 

I have also attempted to use a List web part and create a category column to achieve this as well.  Unfortunately, this looks very clunky, even in the calendar view.  The gallery view is close to what I am looking for but without a power app, once the event is over, the items do not automatically drop off the list.

Are there any recommendations for what I am trying to accomplish?