McNichols Sports Arena was the home of the Denver Nuggets of the ABA and NBA for its entire existence from 1975 to 1999 It also hosted multiple hockey teams, including the Denver Spurs of the WHA during the 1975–76 season, the Colorado Rockies of the NHL from 1976 to 1982, the Colorado Flames of the CHL from 1982 to 1984, the Denver Grizzlies of the International Hockey League from 1994 to 1995, and the Colorado Avalanche of the NHL from 1995 to 1999.

McNichols hosted the NCAA Final Four in 1990, won by UNLV over Duke University and the West Regional Semifinal in 1996. It was also host to the 1976 ABA All-Star Game, in which the host Nuggets defeated the ABA All-Stars, games 1, 2, and 5 of the 1976 ABA finals, and the 1984 NBA All-Star Game. It also hosted games one and two of the Stanley Cup Finals in 1996, where the Colorado Avalanche defeated the Florida Panthers in four games to bring Denver its first major sports championship.

UFC 1, the first event of the Ultimate Fighting Championship, was held there in 1993.

Another notable event at McNichols took place on December 13, 1983, when the Nuggets hosted the Detroit Pistons in a regular season contest. Nugget players Kiki Vandeweghe and Alex English scored 51 and 47 points respectively, while Piston Isiah Thomas also scored 47 points, with teammate John Long scoring 41 in a 186-184 triple-overtime Detroit win over the Nuggets. The game, still to date, is the highest-scoring game in NBA history, and also holds the record for the most players to score 40 or more points in a single game. However, the game was not televised in the Denver area (instead being shown back to the Detroit market, via WKBD-TV) and was attended by just over 9,300 people. This game has since been broadcast on NBA TV and ESPN Classic.

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