You can now track who joins your online event. When creating an event in myUMBC, there is a new checkbox for online meetings:
Track meeting participants (will require login to join)
When someone clicks the Join Meeting button on your event, we will ask them to log in and then add them to the Participants section of the event before passing them off to your meeting URL.
This should provide a simple way for groups to keep track of who's attending their meetings independent of the service they're using.
Note: There is no way to download a list of participants, but the data is available for reporting in REX.