For big numbers I think that the solution is to do half and half.
Firstly get all plates and serving dishes really hot (dampen them and then put in microwave is the easiest way).
I would buy half of the Turkey deboned and rolled and I would serve this in the kitchen plus a small whole one to carve on the table. So, Turkey comes out of oven to rest.
Then half of all veg and sides goes into serving dishes and then back into warm oven. Mix the serving dishes so there are 3 sets with a mix of veg rather than 1 potatoes etc.
Carve the kitchen Turkey, get all the kitchen plating elements ready. Have one serving helper. Choose what you plate for speed so, perhaps, Turkey, pig in blanket, roast veg, 1 green veg.
Seat everyone, table Turkey goes to table for carving. Then serving helper takes anything you aren’t plating - gravy, hot sauces, if you’ve got veg you aren’t plating etc to the table.
Meanwhile you plate a small serving of the same thing for everyone (no requests!) and serving helper takes it to the table. This is the time critical bit, you need hot plates and hot food.
Then once all plates are out you add the spare veg etc to the table.
Good luck!