As others have said, prepare veg the night befor or buy prepped things from M&S. (other supermarkets are available!!) I found it amazing at just how much ready to cook stuff is available now.
How many are launching themselves on you? A turkey crown is smallish and idiot proof, pigs in blankets bought ready to pop in the oven likewise roast spuds. Don't faff about with Christmas pud if you don't want to... trifle or a bought dessert will be fine.
Don't worry about clearing up, cart it all into the kitchen, soak the worst pans and .... leave the washing up till next day. Who's going to see it ??
After your guests have toddled off, pour yourself a glass of your favourite after dinner something (mine's a Bailey's if you're asking), put your feet up, and enjoy the rest of the day doing exactly what you want to do.
Actually I would quite like to do that myself... I'm expected to go to DD2 for lunch, will have to spend Christmas night at hers as no-one can be expected to drive me home after several drinks . when,much as I love them all, I really would far rather it was me and the dog at home watching telly, stuffing myself with chocs, mince pies and the aforementioned Bailey's.