My suggestion is to eat in shifts, I will start with a plate of turkey, stuffing and potatoes. I eat these food occasionally and know how to cover them with insulin. I will then wait to see how my body responds to my first course, if things go smoothly I will then have a drink or dessert and cover that with insulin. I have gotten odd looks when I do this but it is better than being 300 and angry. If that does not sound fun I would suggest going with square wave bolus, I have not tried this during the holidays but a square wave will give you a set amount of insulin over a set amount of time. With a square wave you can eat everything at one sitting and get maybe ten units over a three hour period.
Personally I treat the holidays like any other day, being so obsessed with cycling and working out I tend to watch what I eat more then I probably should. On Thursday I will have my normal breakfast, a small lunch (Peanut butter and jelly sandwich, and a few almonds) and then use Thanksgiving dinner as my mid-afternoon snack. I will have a small piece of turkey, a spoon of stuffing and a dinner roll, again I get odd looks but I know what works and I'm with family so they know how odd I can be. I will then have a bowl of pasta for dinner with a sliver of pumpkin pie. My plan is not for everyone but I wish everyone the best and encourage people to share what works for them.