According to this article dated April 3, Gonzaga had already set a precedent for celebratory champagne revelry. After a team from the Gonzaga Law School won the NC in a moot court competition, the team celebrated with...champagne.
https://www.khq.com/sports/tournament/gonzaga-brings-home-national-title-in-the-courtroom/article_1d2e0ab0-93fb-11eb-a6d1-cf24af87386e.html
https://www.khq.com/sports/tournament/gonzaga-brings-home-national-title-in-the-courtroom/article_1d2e0ab0-93fb-11eb-a6d1-cf24af87386e.html