The Attendance Report is actually almost identical to the Availability Report - it just shows attendance, not availability.
It can be accessed from the event's page, or from the Attendance & Availability page.
One other difference is that at the bottom of the page, it shows the Members At Risk report, which simply shows members that have not attended the last few events. It's there to alert you to their sustained absence so that you can perhaps follow up with them about why they've been absent so much.
