Should I have asked my girlfriend ?

To plan a Super Bowl part ? Ever since I asked her to start planning the upcoming Super bowl party she has been complaining, bitching, whining and moaning that she's doing all the work ! Hello, she practically volunteered to do the whole thing. The party will be for about 20 people, I invited all my guy friends, all she has to do is the usual, chores, get all the drinks, beer, sodas, chips, nachos, salsa, guacamole, clean the big screens, make sure the house is immaculate. While the game is going on I told her she could go to the mall to be out of our way. How can I stop her from complaining ?