About the only thing you could do is make TWO reservations, back to back, for the same resort. "Superpeak" season starts after Christmas and runs for about a week. They give no discounts during Superpeak. Also, their policy is the rate in effect when you check in is the rate for the entire stay.
I have used back to back reservations in the past; my stay started in "standard" season and ended during "value". I made sure they were aware of the back to back, so I did not have to change rooms. On the first day of value season I stopped by the desk on the way out in the moring, checked out of the standarfd rate reservation and immediately checked in with the value rate. All they did was a new swipe of my credit card and gave new room keys.
On the other hand, we checked in to the Contemporary Tower on December 23, 1999 and checked out on January 3, 2000. Our entire stay was at the Value Season rate with Discount ($240/night) while people who checked in on the 27th or latger would have paid $435/night for the same type room.