Well, if you think your guests would go for it, why not casserole some chicken portions in a lovely wine gravy, and roast some potatoes and root veg (potatoes, parsnips, carrots) You could do a few pigs in blankets and stuffing in a dish, and stir fry shredded sprouts or savoy cabbage with pancetta.
The casserole is easily assembled and won't take hours to cook, but will need no attention while in the oven. Peel and chop root veg on Christmas eve and store in the fridge in plastic bags, shove in roasting tin with oil and herbs to roast. You may need to check briefly how these are doing from time to time.
Make stuffing in advance (I make mine well ahead and freeze) thaw out and shove in oven to bake in an ovenproof dish, serve in wedges. Wrap streaky bacon around chipolatas and these can also be frozen in advance, just thaw completely and roast in oven.
This just leaves the sprouts or cabbage to be stir-fried before serving. Shred the veg, leaves only so remove stalks (and big veins on cabbage, this can be done the day before too) Heat wok, and add chopped pancetta slices, cook until beginning to crisp. Add veg, stir fry stirring well for 2 mins, then add a splash of hot water from kettle which will make it wilt slightly. As soon as the water has steamed off, it's ready!
If you have a starter, choose one requiring minimal assembly, and a pud that requires none.