April 30, the day I came out in 1989 (god, 27 years ago!) -- at Austin's gay march. Met my very first girlfriend at the same event. (Her first words to me, at a park after the march: "I've been behind you all day.") She turned out to be a pretty crappy person, but nonetheless that whole day/night was one of the best and most exhilarating of my entire life.
Also the day of the famous "Ellen" coming-out episode in 1997. Oh, and Hitler's suicide, 1945. (Thus, all-in-all, a pretty good day in history!)