Me too. I can’t think of one. Nor can I think of one where this is a thing.
Besides sports, there’s a lot of reasons for kids to stay on campus on weekends. Studying during the day and social events at night primarily. Most schools drive community through events on the weekends. It’s the way for Day students to be connected and boarders to broaden their friend groups and experiences.
As much as schools market the ability to go “insert nearest interesting city and town here,” they don’t really love you leaving campus. My kid has to leave a day a weekend for orchestra, and if truth be told, the school would rather she concentrate her musical activities there. Even more draconian for club sports, where they’re pretty much verboten.