Anyone who's logged in to the Mobile App or the web version of your Event App at least once appears as 'Active' in your Event's Attendees list.
In your Event navigation bar, click Attendees.
Click the Filter drop-down.
Select Active to view anyone who's logged in to your Event App at least once.
Check the box next to the User column heading. The 'Selected' count replaces the filter drop-down and shows the total number of Active users.
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