"This is not the same thing as my prom -- though yes, I did go to that."

She almost didn't -- thanks to her parents tax evasion -- but Xander had come through to her last minute and bought her the dress she had been trying to earn. It didn't make up for cheating on her, for acting like she was the bitch for not forgiving him, but it was a nice peace offering. At least they didn't part high school on completely awful terms.

"I went to most of my school dances -- except for the ones I was kidnapped during."

Which did happen...more than once in her time at Sunnydale.