Yes, I went to two informal school dances (no dates, costumes or casual clothing) when I was a sophomore, and to the three formal dances (dresses and ties, dates) my school had when I was a senior. Most people went to the formal dances starting as sophomores or juniors. I went to two of the formal dances with my best friend who was gay, but he didn't want to go to the Prom with me. My sister had to find me a prom date from another school...
Anyway, school dances were stupid, and I never had a good time at them. I pretended to have fun so my friends wouldn't think I was strange. I was usually on the decorating committee, though, and I loved buying supplies and setting up for them!
ETA: This was in high school. I was invited to some formals at college, but I was too nervous to go and I made stupid excuses to get out of going to them.