Freeze shit!
clear as much freezer space as you can.
Buy
carrots - 1-2kg
potatoes - 2-3kg
sprouts - couple or bags
parsnips.
Peel, chop, bar boil and then freeze in freezer bags.
Stuffing - I do two kinds, sage and onion balls, I make up, freeze on a tray and bag. Two boxes.
Otherone I do is a shallot, sausage meat and sweetcorn one. I make this in a loaf tin, cook though and freeze wrapped in foil.
Red cabbage- double quantity of the Delilah recipe. Freezes amazingly.
Jamie Get ahead gravy - you can stretch this on the day with your meat juices and thicken it with slaked cornflour.
Pigs in blankets - make 30 / 45 as a minimum. Buy them or make them up and freeze them.
Starters - keep it simple, a really nice soup and bread, you could buy some or again, knock it up in advance and heat through in the slow cooker. Or get someone to bring it. Canapés also work well in lieu of a proper starter. A Christmas cocktail, some tiny bites and a mingle / chat is lovely. (Prosecco with something nice poured in, a slice of orange, some pomegranate and a sprig of rosemary)
Dessert - again, ask for some people to bring desserts. Or do something that will be good to sit in the oven, panettone bread and butter pudding with marmalade and baileys is nice, make it the day before and throw it in the oven. Make a retro trifle, again you can do it the day before. You could make a really indulgent rice pudding and it’ll cook while you are eating the main course. Serve with stewed fruits, winter compote or just cinnamon and brown sugar.
I always cook a massive gammon as a second meat, cook I the day before and slice it and serve it cold.
Beg, borrow, steal fridge and freezer space from your guests.
if you want to do cheese, farm that out.
Your frozen veg you can steam, sautee, gratinate, drizzle with stuff or whatever on the day.
Look at your turkey timings and make sure you have time to rest it. Get a meat thermometer if you don’t have one. Rest it covered it foil and then a million tea towels. While it’s resting cook your potatoes and parsnips and heat through any veg / stuffing.
Use foil trays for everything you can to cut down on washing up or decent oven to tableware.