Hmm. A bunch of tales involving girlfriends.
One year I went with a girl who was a good friend without telling my recent ex. My recent ex apparently didn't understand "this isn't working out", so there was a big scene (it was like 7th grade, cut me a break). It was actually pretty humorous.
Fastforwarding to 10th grade, I had told my girlfriend (new one, we'll call her Mary) I was gonna meet her up there. But that day I had went to a friends house and for the first time ever, played a Call of Duty multiplayer game. I was hooked on it, and was about to completely blow off the dance(my thought process being that our relationship wasn't going that well anyways), but realized that I was blowing off women for a video game, so I changed my mind.
I ended up going to the dance. One of the best romantic nights I had. i was glad I went.
11th grade dance, the girlfriend from tenth grade and I had broken up, and I had unknowingly been dating one of her friends (we'll call her Sarah). We had both come to terms with the fact that it wasn't really working out, so we kinda both just decided to remain friend (to this day we are). But Mary apparently decided that I was just dating Sarah to get on her nerves, and she ended up offhandedly insulting me every time I saw her. I ended up cussing her out, and there was a big fight between us. I think somewhere over the next year or so we kinda worked it out. we at least don't hate each other anymore.
Now 12th grade. I took a good friend to the dance (we'll call this one Slutface) who knew that I had liked her for a long time. We had plenty of fun to the point of where she invited me back to her house. My guy friend Steve tagged along with us for a while, and we ended up eating out, doing all sorts of fun stuff. The romantic tension was there, and we both recognized it. I ended up playing it safe and going home that night seeing how I really wasn't able to get away from my guy friend, cock blocking Steve.
It turned out that Slutface ended up inviting over her boyfriend who she had conveinantly not told me about. They did God knows what, and I ended up hearing about it from a friend later.
We still remained friends and even dated at one point, but that ended pretty terribly. A story for another time though.
TLDR; They're a rollercoaster. Don't try to cause any fights and you'll enjoy yourself oh so much more. Don't worry about not having a girlfriend. If the energy in the dance is right, you can pick up chicks like that.