A dry run or rehearsal performed before the actual event to check the flow and procedures.
発表の前に何度か予行練習をして、時間配分を確認した。
I rehearsed several times before the presentation to check the timing.
運動会では係ごとに予行練習を行い、本番に備える。
At the sports day, each group does a rehearsal to prepare for the real event.
舞台装置の動作確認のために舞台裏で予行練習をした。
They did a backstage rehearsal to check the stage equipment operations.