YoshidaEri dont worry about the dance!! (2 costumes in 6 weeks scares me too so dont feel to bad about normal people not panicking I would!) But the dance will be easy to learn...just make sure to practice it a few times in a row each time you practice, and most importantly HAVE FUN!!! It helps you remember the steps easier if you can have a laugh while you do it, sticks better!
Sorry to intrude, just done alot of dance learning in short spaces of time! Curse your Performing Arts course! CURSE YOU!!
Good luck with the dance! Im sure it will look great!