Here's a list that I found of open rides (I typed "open rides Mickey's Christmas party" in Google):
Here is what is open and also locations for free cookies and hot chocolate!:
Main Street, U.S.A.
Food
Casey's Corner
Main Street Sweets
Tony's Town Square
Stores Etc...
Baby Care Center
Emporium (has special event merchandise)
Main Street Cinema
Main Street Confectionary
Stroller & Wheel Chair Rental
The Chapeau
The News Stand
Town Square Exposition Hall
Uptown Jewelers
Liberty Square
Attractions
Haunted Mansion
Food
Liberty Tree Tavern
Sleepy Hollow
Stores Etc...
Ye Olde Christmas Shoppe (has special event merchandise)
Free Cookies and Hot Chocolate!
Columbia Harbor House
Adventure Land
Attractions
Magic Carpets of Aladdin
Pirates of the Caribbean
Stores etc...
Glow Merchandise
Pirates Bazaar (has special event merchandise)
Photo Location
Adventureland Veranda
Free Cookies & Hot Chocolate!
The Diamond Horseshoe Saloon
Frontierland
Attractions
Big Thunder Railroad
Country Bear Jamboree (Christmas Show)
Frontierland Shooting Arcade
Splash Mountain
Food
Frontierland Turkey Wagon
Pecos Bill Cafe
Westward Ho
Stores etc..
Briar Patch
Frontierland Trading Post (has special event merchandise)
Splash Photo (has special event merchandise)
Fantasyland
Attractions
Cinderella's Golden Carrousel
Dumbo
It's a Small World
Mad Tea Party
PhilharMagic
Peter Pan's Flight
Pooh's Playful Spot
Snow White's Scary Adventures
The Many Adventures of Winnie the Pooh
Food
Fantasyland Pretzel
Mrs. Pott's Cupboard
Stores etc...
Fantasy Faire (has special event merchandise)
Pooh's Thotful Shop
Sir Mickey's
Tinker Bell's Treasures
Mickey's Toontown Fair
Attractions
Donald's Boat
Mickey's House
Minnie's House
The Barnstormer at Goofy's Wiseacre Farm
Stores etc...
County Bounty (has special event merchandise)
Tomorrowland
Attractions
Astro Orbitor
Buzz Lightyear's Space Ranger Spin
Space Mountian
Stitch's Great Escape
Tomorrowland Arcade
Tomorrowland Indy Speedway
Tomorrowland Transit Authority
Food
Auntie Gravities
Cosmic Rays's Starlight Cafe
The Lunching Pad
Stores etc...
Buzz Imaging
Mickey's Star Traders (has special event merchandise)
Merchant of Venus
Space Mountain Shop
Photo Location
The Timekeeper Theater
Free Cookies and Hot Chocolate!
Tomorrowland Terrace Noddle Station
Laurie in OH, mom to
Alex, 11 years old
Julianne and Leah, 10 years old
Audrey, 2 years old
WDW visits in 1973, 1986, 1987, 1999, 2000, 2001, 2002, 2004, 2005!
Currently planning a December 9-16, 2006 trip!