Partner won’t do the brunt of it as will want to get pissed (something else I loathe)
No no no.
His family, invited for him. He does not sit & get sloshed. He can relax & have a couple when everything is done.
As suggested above, lists of what needs doing. If there is any sign of him sneaking off to get drunk, "darling, have you done xyz so your mum & dad can do/have/eat what they wanted?"
If I leave it MIL will likely do it - caveat is that she will take great pleasure in moaning about how much work she has done over Christmas.
^^^ Tell her it was partner's choice to host & therefore down to him. She doesn't have to be there.
And quite honestly, if they don't want to travel Christmas Eve, then Christmas Day, early morning will be really quiet on the roads!
Do what you need to do on 24th, doesn't matter if it's a bit noisy. Do not keep the kids quiet. That's not fair to them. This is yours & kids home. It is Christmas. The ILs can go swivel if they want to work in peace. Their car would be quiet. If you let them park on the driveway the wifi should still be in range 😁.
Make this work for you. Boundaries this year makes next year so much easier.
Why on earth are you giving up your bed? Put ILs on air bed/camp bed/sofa. Or put kids in your room with you & free up kids room. You are going to need some sactuary whilst your house is over run with guests.