4週6日目 使用にあたって
Perspective・object・obligation
接続：N／V辞書＋に先立って
before the main event takes place
注意 / Note：Different from the other two models in terms of TIME: the latter happens BEFORE the main event, usually in preparation. Saying 発売に先立って発表した means to announce first, then sell.
比較 / Compare：Same song: 〜にあたって／〜に際して. These models are often mistakenly chosen for each other — carefully read the 接続 and nuances above and then decide.
よく出る形 / Common form：名詞・動辞書形＋に先立って／に先立ち。The latter is the PREVIOUS action: 発表・説明会・下見・リハーサル.
試合に先立って、式が行われた。
Before the match, a ceremony took place.
発売に先立って、新製品を発表した。
Before the sale, new products are announced.
開店に先立って、近隣の方をご招待した。
Before the opening day, we invited neighbors to come.