Attendance

12 clues
Presence
Who's there?
Number present
Those that came
Ballpark figure
Participant count
Ballpark's concern
What a teacher takes
It's taken in schools
Number of those present
Number of people present
Factor in grading, perhaps
Similar answers:
Abidance
Abundance
Accordance
Adance
Adancer
Afterthedance
Allunattended
Anddance
Andwedanced
Armedattendants
Atotsattention
Atten
Attend
Attendance
Attendancesheet
Attendant
Attendants
Attended
Attendee
Attendees