We’ve done it when staying “down home” for Christmas - we need our own bolt hole at that manic time of year, and it means we can host for DDs birthday. Never needed to cook the turkey though.
I bring some decorations, fairy lights, and some tea lights and holders.
I have a box of things for both camping and self catering kitchen, just in case. It’s strange how many don’t have a corkscrew or a wooden spoon... So I have a box gathered over years with things like a decent sharp knife, whisk, small ikea chopping board, little silicon oven mitts, and things to use up like tin foil roll, cling film roll, a salt and pepper grinder, 250ml bottle for olives oil ;filled before we go), 100ml squeeze bottle of washup liquid (travel bottle), handful of dishwasher tablets....for Christmas I usually add a couple of baking trays and a cake tin, just I case.
I make a very detailed list before we go - I know the local supermarket and farmers market, so there are a couple of things I really want that I need to bring from home and I buy the rest there.
And I always throw in hot water bottles, in case the heating isn’t great.
But otherwise, i don’t do much ahead of time to prep.
When dd was small, I would bring a box of strips of different colored paper and let her make paper chains that we could dangle around the place.
Always have a pack. Of cards in my box, and make sure to bring some books. If a large group, id bring some board games too.
Just be prepared to have to do more on the stove and juggle than at home with a full on dinner and have tin foil tins and a roll to make packets, just in case. Or know how to do more on the stove top. Or do 1 roasties per persons with turkey and have another tray on cooking to be ready in time for seconds - that kind of things.
Or to press milk jug into service as a gravy boat, and have to wash it before tea/coffee is served.