attestation ceremony; investiture ceremony
A formal ceremony where credentials, appointments, or official status are conferred and attested. Often used in governmental, diplomatic, or organizational contexts.
新しい大使の認証式が皇居で行われた。
The attestation ceremony for the new ambassador was held at the Imperial Palace.
認証式で彼は正式に大臣に任命された。
At the investiture ceremony, he was formally appointed as minister.