The Attendance page is your register: every attendee, every session, and who actually turned up. Find it under Attendance in Manage Event.
See a running summary of checked-in vs total, per session and across the event.
For a series, the overview shows a session-by-session matrix - open a session from its column header to check people in.
Check people in or undo directly from the list, alongside their ticket, seat and booking details.
Export CSV to download the register, including an Attended column.
Not collecting attendee names on this event? Attendance switches to a headcount: use the stepper on each booking to record how many people came in.
Check-in controls here open 24 hours before the start and stay open afterwards, so you can tidy up attendance after the event. For the door itself, use the scanner - see Check people in with the scanner.