I've stupidly volunteered to host PIL for Xmas day (as well as DP and I and our 3 kids). And on Boxing Day I have PIL, my parents, my teenage brother, my sister, her DP, their 2 children and DPs auntie and 2 cousins.
For Xmas day I've ordered a turkey crown and the gravy from m&s to collect on 22nd and a fantastic overpriced chocolate log.
I'm confident doing the veg and I have a range cooker so have ample oven space.
I'm planning:
Pigs in blankets
Stuffing
Roast carrots and parsnips,
Peas
Cauliflower cheese,
Sprouts cos it's the law
Cabbage
Yorkshire puddings
Is there anything I need to add? We aren't a starter kind of family so no need to bother with that.
I'm mainly getting my knickers in a twist about Boxing Day. Im going to do a buffet but where do I bloody start?
11 adults and 6 kids 
Any advice would be hugely appreciated