attendee; person present
Formal term for someone who attends a meeting, ceremony, or official gathering. Often used in written announcements or reports.
All attendees of the meeting, please read the materials in advance.
We prepared a list of persons present at the ceremony.
Compound of 列席 (れっせき, 'attendance') + 者 (しゃ, 'person'). The word 列席 itself is from 列 (れつ, 'line' or 'row') and 席 (せき, 'seat'), referring to taking one's seat in a formal setting.