I never even usually have a Christmas dinner menu. This year we're having:
fish parcels with dill and beetroot dressing;
roast turkey with sausage stuffing, roast potatoes, herby roast root vegetables, and sprouts with shallots and pinenuts;
Christmas pudding and brandy butter or warm brownie with clotted cream.
This is obviously the answer: tell myself whatever I'm planning for is happening a week earlier than it actually is. Do you think that would work?