It is always around the same time - this year I think it is Dec 4 - 10, so next year is probably Dec 3 - 9. I have been there several times during this and haven't seen much impact (just one day at MGM, a group of cheerleaders broke out into cheers!), but we usually stay at the BW. However, one year I did stay at ASSP during that time and except for noticing lots of the kids around, I didn't notice much different. However, others do have different opinions and experiences with this. (And since we will be there again this year during that time, I hope my experience is still good)