Lidl goose fat frozen roast potatoes.
Stock up with lots of Part baked bread- lasts ages and so useful for brightening up lunches and soups.
Allow longer for food to cook as the amounts will be bigger.
Use slow cookers- for keeping things warm as well as cooking.
Cook ahead and freeze stuffing balls, pigs in blankets etc.
When the turkey comes out to rest, the frozen goodies go in in batches. Potatoes last so they stay crisp at serving.
Cold starter- salmon, rocket, melon or tomatoes/mozzarella/basil, pate and Melba toast or something.
Plan the meals and start cooking and freezing now- lasagne etc.
Get things out the day before to defrost. Large volumes take an age both to defrost and to cook from frozen!
Use the back doorstep as a fridge extension. Good for drinks, but also arrange some big plastic boxes for cheese, salad etc.
Meal suggestion- cook a big ham for serving cold after Christmas. Do frozen pea and ham stock soup with part baked bread for Christmas Eve. So fast and easy, light in readiness for Christmas.
Go for convenience on Christmas Day, as you want to join in more.
Set up a drink station and nominate a family member to do it, keep randoms out of the kitchen.