Interesting question, and not unreasonable given the cost of hotels that weekend.
I do know of one school that covers some things outside of tuition. For instance, if a student qualifies financially to attend for free, they may also be given a monthly stipend on account to spend at the bookstore and on campus eatery, so that they can fully participate in the academic and social offerings of the school. I’ve heard of schools offering help with purchasing winter coats for students from warm climates. Perhaps family weekends inspire a similar policy? Though I imagine it would be on a case by case basis. It can’t hurt to call and ask