I'm having a party this weekend and I already got my grocery shopping done for it! I refuse to be last minute like last time.
I have a friend who plans ahead like that.  I'm a last minute gal.  I think you will be less stressed by planning ahead.
I will be and be able to enjoy myself more in the days leading up to the party.
Not to mention enjoy the actual party, too!  Are you celebrating anything in particular?