The CP weekend is the Candlelight Processional. I have never been to see the CP, but I think it takes place on the first weekend of December (someone correct me if I am wrong). It attracts a lot of guests.
Oh, and to the OP, one thing I forgot to mention yesterday when I was recommending doing the 12/20 - 12/24 dates rather than the dates post-Christmas, some holiday things stop as soon as Christmas is over. 95% of the holiday decor, food and events are up until early January, but Santa leaves as soon as Christmas is over, the Photopass set-up in the GCH is gone and the Carolers may be gone. The Carolers are not set in stone to hang around when Christmas ends, so it is not a guarantee that they will be there. So if things like Santa and carolers are important to you, then definitely do the pre-Christmas dates (not to mention the previous reasons I stated for why befre Christmas is better).