attend的名词是attendance；
attendancen.出席；参加；上学；到场；出席人数
There was an attendance of 42 at the meeting.
有42人参加了会议。
Police in riot gear were in attendance as a precautionary measure.
身着防暴服的警察到场实施预防行动。
Attendance on the course is purely voluntary.
听这门课纯粹是自愿的。
