a ceremony to celebrate the start of a public event or the first time a new building, road, etc. is used
افتتاحیه, مراسم افتتاح, گشایش, افتتاح, مراسم آغازین
the official opening of the new hospital
the opening of the Olympic Games
the state opening of Parliament
tickets for the opening ceremony
The gallery has scheduled a grand opening for June 29.