Hosting and having an elaborate menu is wonderful if you're up for it. I've done it for many years and enjoyed the challenge.
If it's way too much work, you got a scale back.
Gently, I suggest the menu is a bit ambitious but only if you're stressed for time/willing to scale down (things can be made more simply).
To try to answer your question directly, I noticed that you have four different types of potatoes on your menu. I have never frozen potatoes but I have seen frozen mashed potatoes and possibly frozen scalloped potatoes at the store, I guess if they're made commercially they must be able to be frozen and recooked successfully. There's a possibility that you could do that as a prep ahead of time?
I've made sauteed brussel sprouts with bacon many times, but never prepped ahead of time aside from washing and trimming the sprouts, cutting in a half, and storing in the fridge but we're talking only a day or two ahead of time. Not something that can be done 5 weeks ahead.
Same with your savory stuffing, can be made a few days ahead of time. Not so sure that you'd want to make it now and freeze it.
Ditto with the carrots, they might be able to be washed peeled sliced and put in the fridge a couple of days ahead of time. The turkey and the ham will have to be done the day of. I can imagine myself making your menu there and I can see making sure the house is clean ahead of time, then prepping the potatoes carrots and brussels, and then a lot of work leading up to dinner time as you'll have all your burners on the stove running as well as the oven full.
Going "more simply" does not mean less of an experience. It's taken me 20 years to realize that in the end, nobody cares how fancy the potatoes were or if you made your own scratch bacon whiskey jam from scratch. In the end all they remember is how smoothly the day went, and how relaxed the hostess was and how the day made them feel.
I'm guilty of having elaborate menus, elaborate decorations, having made everything from scratch, no help, and when everyone comes I never get to sit down, I never get to eat with everyone, I never get to greet anyone properly, I never get to be a part of the day I feel like I'm the maid/cook/bus person.
The last year or so I've started forcing myself to cut a couple of courses out of the meal that I've planned, and simplifying just a little, and it's given everyone so much more pleasure, myself included. It has been extremely difficult for me to learn to scale back a bit as I enjoy the challenge of making an event more and more memorable... But in the end, it's the experience not the food that matters.
If that helps.