NHLウィンター・クラシック(英: NHL Winter Classic)は、毎年元日(元日が日曜日の場合は月曜日)にフットボール競技場や野球場で開催されるNHLの屋外試合である。
引用元:NHLウィンター・クラシック – Wikipedia https://ja.wikipedia.org/wiki/NHL%E3%82%A6%E3%82%A3%E3%83%B3%E3%82%BF%E3%83%BC%E3%83%BB%E3%82%AF%E3%83%A9%E3%82%B7%E3%83%83%E3%82%AF

The NHL Winter Classic is one of the three series of regular season outdoor games played in the National Hockey League (NHL), and is distinct from the league’s other two series, the NHL Heritage Classic and the NHL Stadium Series. The Winter Classic is annually held on or around New Year’s Day, generally in a football or baseball stadium, in an area with a resident NHL team. The first Winter Classic was held in 2008 at the venue then known as Ralph Wilson Stadium (now New Era Field) in Orchard Park, New York, between the Buffalo Sabres and Pittsburgh Penguins. A total of eleven have been held. The most recent game was played during 2018–19 season at Notre Dame Stadium, with the Boston Bruins defeating the Chicago Blackhawks 4–2.
引用元:NHL Winter Classic – Wikipedia https://en.wikipedia.org/wiki/NHL_Winter_Classic