You guys are really not good at this "prom" thing, are you? Don't worry Nocturne, I got your back on this. Here's what you do:
First, you'll need red paint and a brush. Now go to her neighborhood and paint a red X on every house in there except hers. Now she and her family may or may not start freaking out because they didn't get an X on their house, so the next step is to kill her household's first-born son. No son? Youngest daughter it is! Is it her? Then just, like, key their car or something. Anyway this'll get them super scared and shit. That's when you show up, barely chested, flexing your manly pectorals in splendiforous brilliance. She'll be all like, "My hero!". But that's when one of your friends shows up, pretending to be the culprit behind all the terrorizing acts of terror. Now you're all like, "I'LL PROTECT YOU!" and you fight him. Now take out your trusty bowie knife and proceed to stab him in the chest, carving the word "PROM?" into the chest cavity of his soon-to-be corpse. Then he dies. Then you guys bone or something.
Prom.