attender

(n) someone who listens attentively auditor, hearer, listener,
(n) someone who waits on or tends to or attends to the needs of another attendant, tender,
(n) a person who is present and participates in a meeting
- he was a regular attender at department meetings
- the gathering satisfied both organizers and attendees
attendee, meeter, attendant,

auditor hearer listener attendant tender attendee meeter

attended attendee