ring-opening ceremony
Sumo term: a ceremony held when a new dohyō (ring) is built in a stable, marking its first use.
新しい部屋の土俵開きには、多くの力士が集まった。
Many wrestlers gathered for the ring-opening ceremony of the new stable.
Compound of 土俵 (dohyō, 'sumo ring') and 開き (hiraki, 'opening'), referring to the ceremony of opening a new ring.