The Mets web site is having a fan vote contest for the top moments at Shea Stadium. It's not just Mets stuff, so it's 75 dates. Can't list them all here.
I don't think this moment will win.
July 9, 1971 – Grand Funk Railroad in concert becomes second group, after the Beatles, to sell out Shea Stadium.
This one probably will:
October 25, 1986 – World Series Game 6 vs. Boston. Buckner. Mookie.
What do you think?