Count Participants for an event Conference Template

I am building an app for an event using the Conference Template. There are different seminars with different availability.
I want to build a functionality that counts “Favorites” for every user and event so people can RSVP and see how many people will be attending the seminars.

I created a Rollup to count favorites but it sums it all up. Is there any way I can sum up only the favorites for a particular event?

Here is a link to the app

There is no way to reliably sum a User Specific Column.

One thing you could do is make a new table for each event , “Signed Up” which would simply have a RowID and a User ID. Then you could simply sum the records in that Table.

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