I know exactly what you mean. We diet in advance. Not consciously, but we do find ourselves holding back, although we do go to a lot of social events and mince pies are so fattening that it's a good thing. I live on boiled eggs, or poached egg on toast, for about a month before Christmas. I sing in several choirs so can't have dairy and need snacks at weird times, poached egg is perfect. DBH lives on sausages in rolls as he too careers about the country singing at various events. I eat lots of raw carrot and fruit and I make masses of flapjacks, because they are portable and filling and I trust them more than I do those cereal bars. I ate one last night for my tea between rehearsal and performance. Tonight I was in and did have a jacket potato with cheese and salad. I rather like not having to bother about cooking proper meals, this is the only time of year that it happens. If DBH gets fed up he makes himself a cooked breakfast, even if it's at midnight when he gets in. He eats lots of nuts and dried fruit and we grab pears, apples, oranges and grapes.
I think what I have very long-windedly meant to say is, don't worry about finding different recipes. If you too are going to have a hectic time, then have a bit of a break from all the food and cooking and just snack for a few days. Bread and flapjacks and poaching eggs are my limit during this time. Explore your stock of tins - I had a very elderly tin of herrings on toast one evening, with tomatoes.