8/6, 1990, Jumbo Tsuruta vs Mitsuharu Misawa. Obvious pick, it's The star making match of AJPW, the passing of the torch between generations.
Honorable mentions include:
Kawasaki Dream, seeing Cactus Jack vs Terry Funk would be wild.
Heatwave 98', that Shinzaki and Hayabusa v RVD and Sabu match is a ton of fun.
7/8, 1976, Madison Squared Garden, 70s MSG shows have some of the hottest crowds around, and the big match on this card is a steelcage grudge match between Stan Hansen and Bruno Sammartino, only a few months after Hansen broke Sammartinos neck.
I lived in San Francisco when Eddie beat Brock for the title at the Cow Palace but I was too much of a broke, ignorant high schooler to even know how to get a ticket.