The NHL Winter Classic (French: La Classique hivernale de la LNH) is an annual outdoor ice hockey game played during the National Hockey League's (NHL) regular season on or around New Year's Day. It is generally held in a football or baseball stadium in the United States in an area with a resident NHL team, though for most of the game's existence, they are usually played in a baseball stadium to avoid scheduling and logistical conflicts with football stadiums during the National Football League regular season.
https://en.wikipedia.org/wiki/NHL_Winter_Classic