NHL Heritage Classic

The NHL Heritage Classic () is one of the series of regular season outdoor games played in the National Hockey League (NHL). Unlike the NHL's other two series of outdoor games, the NHL Winter Classic and the NHL Stadium Series, the Heritage Classic has been held infrequently: only five games have been played in the series, and the match-ups have been exclusively between Canadian teams. The inaugural Heritage Classic, hosted by Edmonton at Commonwealth Stadium in 2003, was the first outdoor regular season game in NHL history and its success served as the precursor to outdoor hockey games played around the world. The second, hosted by Calgary in 2011, set sponsorship and revenue records. The third was hosted in Vancouver's BC Place stadium in 2014. The fourth game was hosted by Winnipeg at Investors Group Field, now known as IG Field, in October 2016. The fifth game was held in Regina, Saskatchewan in October 2019, in Mosaic Stadium.
Through the 2019 game, the Toronto Maple Leafs are the only Canadian team who has not yet been selected to play in a Heritage Classic (although they have appeared in a Winter Classic, the Centennial Classic and in one Stadium Series game).
History.
The first Heritage Classic was played in 2003 and hosted by the Edmonton Oilers. The first regular season outdoor game in NHL history, it was held at Commonwealth Stadium between the Oilers and the Montreal Canadiens. The Oilers had suggested the idea of hosting an outdoor game as early as the mid 1980s, but the genesis of the 2003 event was the "Cold War" outdoor game played two years prior between Michigan State University and the University of Michigan.
Demand for tickets to the game was unprecedented in the history of Edmonton sports events. After sales to Edmonton's season ticket holders and league sponsors, the Oilers held a lottery for the remaining 7,000 seats that awarded 1,750 persons the opportunity to purchase four tickets each. The team received over 750,000 entries from around the world. The game attracted a crowd of 57,167 that set an NHL single-game attendance record that more than doubled the previous mark. The event featured an alumni game between past greats of the Canadiens and Oilers, including Wayne Gretzky and Guy Lafleur. The game itself was played at a temperature of ; the Canadiens defeated the Oilers by a score of 4–3.
The success of the Heritage Classic led to the 2008 Winter Classic, which was played in Buffalo between the Buffalo Sabres and Pittsburgh Penguins. A new league record crowd of 71,217 watched the Penguins defeat the Sabres in a game that quickly became the NHL's showcase event. The Winter Classic became an annual event but focused on American teams. Faced with increasing criticism at the lack of Canadian participation in the Winter Classic, the NHL revived the Heritage Classic in 2011 and pitted the Canadiens against the host Calgary Flames. It marked the first time the NHL held two outdoor games in the same season, a decision that some commentators, including ESPN's Scott Burnside, argued would dilute the spectacle of the Winter Classic.
Like the Edmonton game, the 2011 Heritage Classic was a success, as the Flames defeated Montreal 4–0 in front of 41,022 fans at McMahon Stadium. The game achieved high television ratings in both Canada and the United States and, due to record sponsorship, grossed the highest revenue for a single event in NHL history.
The third Heritage Classic was played at BC Place in Vancouver in 2014 between the Vancouver Canucks and Ottawa Senators. It was part of a six-game outdoor set during the 2013–14 NHL season that included the 2014 Winter Classic and the four-game Stadium Series.
The Winnipeg Jets played host to the Oilers in the fourth Heritage Classic on October 23, 2016, at Investors Group Field, during the 2016–17 NHL season. 
The fifth Heritage Classic was played on October 26, 2019, during the 2019–20 NHL season, with the Jets and the Flames at Mosaic Stadium in Regina, Saskatchewan, a neutral site roughly between Winnipeg and Calgary.