Every home chef should have an alternative plan ready to be deployed. I did, with this
Aldi's dessert saving panettone trio which has three minis : Classic, Tiramisu and Cranberry. These can easily be toasted and served with marscapone or butter. If I didn't have these I might have tried Nigella Lawson's no churn salted caramel ice cream. This is just mixing dulce de leche with whole cream and flavoring with bourbon and flaky sea salt (think Malden's).I could also whip up a quick chocolate mousse using Cool Whip and Instant chocolate pudding. It's an easy dinner - penne with crockpot sauce so the meal in itself is flavorful. Dessert would only be gilding the lily. Just remember that whatever sweet you have around can be made into some kind of dessert. Trifle is the easiest. You probably have most of the ingredients. Just add a good slug of brandy and it's a boozy fun end to a Christmas meal.
The same philosophy goes for the main meal. There are ways to fix a holiday cooking mistake. Those hams or beef roasts sometimes get burned. Cut away the burned part , cut up the roast into pieces and continue cooking. If the entire thing is completely charred then first put the pot into a larger pan than it. Fill this with ice cold water to cool it and after a while taste the meat. If it's still bad, then emphasize the sides as the main meal. Rummage through the freezer quick or ask a guests (Namely family and friends who will help out in a pinch) what they have. You may have to cobble together frozen burgers and nuggets but at least it's something. If you still want to serve the main dish, then cut away as much as the burnt roast as possible then stir fry it with veggies such as tomatoes from the salad or the Brussels sprouts. Add a dash of some flavorful spice like turmeric or cumin to minimize the burn taste. If your holiday turkey is too dry then boil up some chicken bouillon with butter and pour over the bird to moisten up the meat. If the gravy is horrible add chicken broth to give it more flavor. Sides nor up to par? Sprinkle with Parmesan to make them more palatable. Another idea just serve more salad with the along with plenty of bread.
There always has to be a Plan B when it comes to holiday baking and cooking. Just be prepared for whatever your kitchen and fate throws you. You can get through it and still have a pretty tasty holiday dinner.