I was going to suggest the same thing. My sister did this a few years ago for the family Christmas get-together, and it worked out great. (She actually just made ONE turkey, but she did it the day before so there would be less to do that day). It reheated just fine, and tasted delicious.
Originally posted by Lrimerman
I have not had a problem roasting one the day before and carving it and then reheating it the next day in a roasting pan. I sometimes pour some chicken broth over it before reheating to keep it from drying out.
Less rhetoric, more cowbell!