My senior year at Michigan State, I attended an event called “The Cold War”. They converted Spartan Stadium into an outdoor hockey rink for a game between MSU and um. The outdoor game was the first of its kind, though it would promptly inspire loads of imitators, and at the time, it was the highest attended hockey game in history.
Despite the fact that these outdoor games now happen a few times a year in both the NHL and collegiate levels, making use of football and baseball stadiums alike, the novelty of the event has not worn off.