Attendance applies to team events.
RSVPs and attendance are different things
An RSVP is someone's intention to attend, given beforehand. Attendance is what actually happened, confirmed during or after the event.
Logging attendance for someone else
Coaches and Captains can RSVP for any team member ahead of an event, or mark attendance during and after it.
Seeing attendance history
For one event: open the event from the calendar
For one person: open their profile and look at the Accountability metrics, which show attendance over the past month
For the whole team: Coaches can open the Attendance report at app.crewlab.io/analytics/attendance