our formal is the 24th too
its not anything too fancy since there are only like 30 of us- we either hold them at our house since we have a ballroom- or this year its at our favorite bar- its basically a big party.... i'm not going since i'm here- but to answer your question- i usually recycle dresses from high school or i borrow dresses from friends/sisters or i just make up a fun outfit wtih a long skirt and a pretty top or soemthing....