I know, I've been pretty fortunate to witness MANY great sports events and witness some very "special" games. Not listed are horse & auto races, tennis, golf & skiing championships, IA wrestling, many reg. season games, and various unaffiliated bowl games (by nature of living in Florida for 8 yrs).
I have NO particular order, but I have MY TOP 10 of what I have personally attended, (as I do for music concerts). Anyhow:
1) 1980 US Olympics Lake Placid --US vs Romania & US vs Czech. [Family vaca to visit relatives in upstate NY when I was a HS Sr]
2) 1996 Stanley Cup finals Game 4 in SoFlorida --Colorado Avs over Fla Panthers [got kicked out in 3rd period, only to sneak back in for 2nd and 3rd overtimes and see the Avs win 1-0, & see the Cup hoisted]!
3) 2001 Stanley Cup finals Game 6 in Meadowlands --Colo Avs over NJ Devils [road win tied series to draw game 7, won by Avs...also attended game 4 in NJ]
4) 1997 World Series Game 7 in SoFlorida -- Fla Marlins over Cleve Indians [lived in SoFla at time, game went several extra innings b4 Marlins clinched it, also attended Game 1]
5) 1998 Super Bowl XXXIII in SoFlorida --Broncos vs Tim Dwight & Falcons [game was not a close game, but it was the SB and a great event, and my team won...and a Hawk housed a KO]
6) 1987 AFC Championship Game in Denver -- Broncos vs Cleveland [1 yr removed from the drive; this game was "the fumble", Denver was lucky to win](runner-up for playoff games--1991 vs Houston, Denver won 26-24)
7) 1990 Final Four in Denver --semi final game UNLV v Ga tech [year Tarkanian's Rebels were on fiya, beat Duke in final game]
8) 2005 Capital One Bowl in Orlando -- Iowa v LSU [attended with some other fellow HNers "The Catch"]
9) 1981 Rose Bowl Iowa v Wash -- [poor showing by team, life changing showing by fans and bowl events]
10) 1985 #1 Iowa vs #2 Mich -- Kinnick [12-10, "The Kick"]
You asked...but thanks for letting me reflect!