Oooh, I am good at this and have diffused many a potential Christmas catastrophe. Are you having turkey or beef? Beef is easiest (temp for meat is the same as roast potatoes) and ham is best as you can make it on Christmas Eve.
BTW Good Housekeeping publishes Christmas Day timetables and menus with recipes in their Christmas edition. And they actually work.
Here is our (Southern) timeline:
(I am assuming Christmas cake, christmas pudding or other puddings are already made, marzipanned and iced or bought).
Christmas Eve:
Boil and bake ham (for Boxing day or Christmas day)
Make braised red cabbage
Make stock for gravy
Make cheese sauce for cauliflower cheese
Make brandy butter and cranberry relish if you are making those
Have simple cheeseboard/smoked salmon type evening meal (or ham) to avoid detroying the kitchen for an additional cooked meal.
It is easiest to attend Church/Mass on Christmas Eve if cooking.
Christmas Day:
Whatever o'clock: If you are doing Turkey get up however early you need to to put the old bird on.
6-7am stockings
7-8am breakfast and cooks have showers and get ready
8-9am veg prep is done
9-10am presents
10-11am - do remaining veg prep/lay table
11 am - put pudding on to steam and potatoes on to par boil and tray of oil/duck fat into oven to heat up to smoking point (chef's perk = glass of fizz)
11.30am - put roast potatoes in oven along with beef (if having)
12noon - start cooking veg. They can stay warm in tureens with foil over as and when they are ready (the hostess trolley is ideal if you have one. My Granny did). If you are having a turkey, take out now and cover top in two layers of foil, still in roasting tray to catch juices.
12.30am - make gravy, puts pigs in blankets on
12.45am - start carving meat joint and serving up
1pm - eat (you can be an hour late here and nobody is that fussed if you give them any fizz that might be remaining at this stage)
3pm - (after Queen's speech if you do it) serve up pudding
Boxing Day:
Make cauliflower cheese and put baked potatoes in oven and serve with sliced ham.