This allows you to take attendance for an active date. You will see a list, and when a participant shows up, you can press I'm Here on the right of their name. Alternatively, you can leave a tablet with the page open to allow them to check in when they arrive.
1 - Access the 'Live Attendance' feature
2 - Select an active team
3 - Select a open date
4 - Take attendance by pressing I'm Here.