How do you get your parents to give your Christmas present early?

Hi there,im having the same problem. You see, I am going to the theatre on Thursday and then have a nonuniform day at school on Friday. I've got uggs for Christmas =, and am desperate to wear them. I've decided to try the " one time wont change the tea in china" and " if i know what im getting it wont make a difference" trick, but i doubt it would work. I will try though!
make a bet or get a good reportcard