Oh I just don't make a big deal out of it 😆
I buy a bird in late November and stick it into the freezer. Shops have never been emptied of the seasonal veg or potatoes, so I leave them until the last minute. These days I tend to buy pudding rather than faff around with making it. There'll be a trip to the German supermarkets at some point for Christmassy sweets, but again, they don't tend to run out unless you try shopping on Christmas Eve.
I have a set budget of around £100 per child for gifts and follow the 1 thing they want, need, wear, read rule. It might be boring to others, but they get plenty of presents off relatives, and seeing as my side of the family are dead and I'm divorced from the other side, my list of who else to buy for is extremely small.
Decorations are reused every year, though we do buy a new ornament or two for the tree every year, with the idea that the children will have their own set collections by the time they're leaving home (they don't know that part and just choose one every year). I buy a tree early in December, care for it properly and it lasts until NYE, but we also have a plastic tree for the kids to decorate as they see fit.
We don't do December boxes/ Christmas Eve boxes or huge events like meet Father Christmas. We may go ice skating, but that's easy enough to book where I am. We will see the Christmas train coming round, go Christmas light spotting, bake and craft, have a refillable Advent calendar each, which gets stocked in late November. We're fairly traditional and chilled. The kids love every bit of it, even the adult teen.