You can view who has registered, manually add participants, mark registrants as "Did Not Show," and remove registrants.
In the Management Panel:
From the View Registrants screen, you can see all registrants grouped into shifts and make the following changes:
Download a CSV file of all registrants sorted by Shift
Add a new registrant to a shift (must be an Active User)
Remove a registrant from a shift if you know if advance they will not be attending or you want to move them from one shift to another.
Mark a registrant as "Did not Show" if they were not present at the Event.