A rehearsal or dry run carried out before the real event to prepare and test procedures.
式典の前日に予行演習を行って、動線を確認した。
We held a rehearsal the day before the ceremony to check the flow of movement.
スピーチの予行演習をしてから本番に臨んだほうが安心だ。
It's reassuring to do a rehearsal of your speech before the real thing.
軍は上陸作戦の予行演習を繰り返した。
The military repeatedly carried out rehearsals for the landing operation.