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.
新しい美術館のオープニングイベントに参加した。
I attended the opening event for the new art museum.
I heard there will be a grand opening event for a large bookstore in front of the station next month.