オープニングイベント

noun

opening event; opening ceremony; grand opening

Refers to a special event held to mark the opening of a store, facility, exhibition, festival, or similar occasion. Often implies festivities, ceremonies, or promotional activities.

• 新あたらしい美び術じゅつ館かんのオープニングイベントに参さん加かした。

  I attended the opening event for the new art museum.

• 来らい月げつ、駅えき前まえに大おお型がた書しょ店てんのオープニングイベントがあるらしい。

  I heard there will be a grand opening event for a large bookstore in front of the station next month.