Jenn's Group Marcus Flint came as himself because he hates dressing up. If anyone asks, he'll just say he came as a Muggle. He came with Lucian Bole because it's his boy's birthday. He got stuck inside a flying pumpkin with Alicia Spinnet for a while, and then actually lost his powers and became a ~muggle~ after eating a cupcake.
Delilah Moon (leap) came as ICON Cher Horowitz. She had a little trouble walking around in those platform heels at first, but she managed to hold her own after an hour or so. She had one of those vampire shots. Who told her what to do (and what did they tell her to do)?
Ginny Weasley (onlygirl) had an overly lengthy conversation with Taisia Belikova about her costume plan (a vampire from one of her favorite wizard novels). After Tai vetoed her idea, she was encouraged to instead dress up as SA's very own Rose Hathaway! She got very dance happy after those Jalapeno things, and probably would've tried to persuade Harry to be her dance partner.