ちゃくせき着席chakuseki
1.
The act of positioning oneself in a designated seat, often in a formal setting such as a meeting or performance.
2.
The process of arranging oneself in a sitting position on a chair or similar furniture, typically indicating the beginning of an event or activity.
3.
The action of occupying a seat, signaling readiness or participation in a gathering or event.
4.
The transition from standing or moving to being seated, often accompanied by a formal request or instruction to take one's place.
Example:
どうぞご着席ください、みなさん。