 In the 1998–99 season, the Oilers joined the Western Conference's Northwest Division.On November 22, 2003, the Oilers hosted the 2003 Heritage Classic, the first regular season outdoor hockey game in the NHL's history and part of the celebrations of the Oilers' 25th season in the NHL.They were defeated by the Montreal Canadiens 4–3 in front of more than 55,000 fans, an NHL attendance record, at Commonwealth Stadium in Edmonton.