I went to both of mine. The first one was great - only about a quarter or less of the year turned up, and that was mostly people I'm sociable with, so it was like a big party. I asked a guy to go with me: he said yes, then changed his mind later (I found out on the day it was because he was gay).
The second one... wasn't so good. What I can remember of it was fun, but I got tipsy, forgot I wasn't meant to spend so long on the dance for and ended up having a seizure. I can remember perhaps an hour of it, and then little bits. It was still worth it though! Almost left my camera behind, but luckily one of the teachers picked it up so I got it back.
They do balls at the beginning and end of term here, but I don't think I'll go. If I do, it'll be the last one before I finish uni.
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I would be the laziest girl in the world, but it's too much effort.