Christopher and Steer are both correct. #1 you are cutting it way close to be performing something you haven't even put together yet
#2 Think of effects that you can do already comfortably and "adapt" them to Christmas
Example: Hippity Hop Rabbits, Take this idea and make a Hippity Hop Santa or Hippity Hop Candy Canes (easier to cut out of thin wood)
Any silk effects with a change bag or modify a brightly colored gift wrap bag: Use Red, Green and White silks
Sponge balls could be Rudolph's red nose (make up some patter)
My mentor did a routine known as the Dancing Christmas Trees which was a holiday spin to the Hippity Hop Rabbits, the closer was Santa & Frosty. I don't know who has it now it went to auction years ago.
These are some cute ideas. . . I've done billiard balls as Tree Ornaments and played with Chinese Sticks done up as Candy Canes/Peppermint Sticks.
Depending on your budget, you could order in a Chinese Snow Storm kit, always good for this time of year and if you can drum up a couple of souls to help, you can build a Triangle Illusion (see the Mark Wilson book) that looks like 3 big Christmas Cards (get help from the art department of your school) and produce Santa as the finale' to your show.
Thing is, this routine requires quite a bit of rehearsal. It's not impossible to be ready with only a few hours of practice, but you're pushing it, in that you have to double check your angles, etc.
OH! A Square-Circle Production set from which you can produce a ton of garland and toys. . .