I'm a regular volunteer at GKTW and as far as I know there is no change to the party schedule due to the holiday. So it looks like Santa will be in the Village on Thursday night, the 23rd.
Here is the weekly schedule: (If it changes for Christmas week, I will edit it so that it is correct.)
SUNDAY
The Worlds Largest Candy Land game from 7:30 p.m. to 8:30 p.m. at Matthews Boundless Playground.
MONDAY
Disney Character Photos at Julies Safari Theatre from 8 a.m. to 8:30 a.m. and 9:30 a.m. to 10 a.m.
Kids Night Out/Grown-ups Night Off from 5:45 p.m. to 9 p.m. at Amberville Train Station
Discovery Cove Animal Exploration from 6:45 p.m. to 7:30 p.m. on the Avenue of Angels
Safari Double Dare in Julies Safari Theatre from 8 p.m. to 8:45 p.m.
TUESDAY
Nickelodeon Character Photos in the Castle of Miracles from 8:30 a.m. to 9:15 a.m.
Big Splash Bash 8-9PM
WEDNESDAY
Horseback Riding from 8 a.m. to 11 a.m. at Keatons Korral
Kids Night Out/Grown-ups Night Off from 5:45 p.m. to 9 p.m. at Amberville Train Station
Village Idol in Julies Safari Theatre from 7:45 p.m. to 9 p.m.
THURSDAY
Disney Character Photos in Julies Safari Theatre from 8 a.m. to 8:30 a.m. and 9:30 a.m. to 10 a.m.
Winter Wonderland from 6:30 p.m. to 8:30 p.m. on the Avenue of Angels and the Castle of Miracles
Carriage Rides from 6:30 p.m. to 8:45 p.m.
Winter Wonderland Parade at 7:45 p.m. on the Avenue of Angels
Santa Claus in Julies Safari Theatre from 6:30 p.m. to 8:30 p.m.
FRIDAY
Universal Orlando Character Photos from 8:30 a.m. to 9:15 a.m. in the Castle of Miracles
Pirates and Princesses Party with Shamu and friends from 7:30 p.m. to 8:30 p.m. on the Avenue of Angels
SATURDAY
Horseback Riding from 8 a.m. to 11 a.m. at Keatons Korral
Mayor Claytons Birthday Party from 7:45 p.m. to 8:30 p.m. on the Avenue of Angels