〜に先立って
prior to, ahead of
Noun / Verb dictionary form + に先立って / に先立ち
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に先立って means "before", for something done in preparation for, or ahead of, a main event: 試合に先立って、開会式が行われた, "an opening ceremony was held before the match".
It's the formal, written version of の前に, and it's common in news and announcements: 映画の公開に先立って、試写会が開かれた, "a preview screening was held ahead of the film's release".
The first half is usually a significant public event, and the second is a preliminary step. 先立つ literally means "to stand ahead".
In formal writing, it's に先立ち. Before a noun, it's に先立つ.
Examples
試合に先立って、開会式が行われた。
An opening ceremony was held before the match.
映画の公開に先立って、試写会が開かれた。
A preview screening was held ahead of the film's release.
工事を始めるに先立ち、住民に説明した。
Before starting the construction, we explained it to the residents.
出発に先立って、荷物を確認してください。
Please check your luggage before departure.
会議に先立って、資料が配られた。
The documents were handed out ahead of the meeting.