During my freshman year, I was dating a junior and we went to her prom. It was for an all-girls Catholic high school and it was held at, of all places, Bimbo's 365 in San Francisco.
My junior year, I went to my school's prom with a girl who was a friend. Nothing much to report there, other than she eventually married the best man from my wedding.
By the time of the prom my senior year, my girlfriend and I were already engaged for all intents and purposes. (We were married 3 months after graduating high school and will be celebrating our 20th anniversary later this year. But, I digress...) Neither of us really cared about proms that year, so we didn't go.
Sorry if you were looking for something exciting and got this instead.