I was never into dancing and didn't go to any of the typical school dances, but I went to 4 proms; girlfriend's junior/senior and my junior/senior (she was a year ahead of me). I don't know about now but back then, in the mid '80's, everyone went to "The Prom", even us stoners. Like Mac and Plant have said, it's about the experience. And, I'd be willing to bet that if you asked 100 people in their 30's who did go, and 100 people in their 30's that didn't go, a lot more people would regret not going than going.