Months ago, we had planned to hold the reception in the "park" on campus where students later put up their encampment, that administrators & police then removed. It would have felt awful to hold it there under these circumstances, so we moved to a state park a few miles away with oil extraction as backdrop for the recreational setting.
My heroic colleague bought snacks and beverages and and served them out of his trunk, which saved us probably $19,000 too.