Good advice Marja.
We are going to a pre Christmas lunch today. Everyone is taking one course and the appropriate wine. We will be a mixture of Brits, French swiss and danish so is usually an interesting meal!! We chance venues every year.
I can honestly say I have never ever had to cook the Christmas meal on my own. here of course it is on the 24th but back in the days when i was working and we usually had 10 or more guests absolutely everyone did something, as you say it's part of the joy of the occassion. When the children got a bit older we always had (and still do) a lovely brunch after present opening then a very late lunch , more like an early dinner! The older generation always helped with the vegetables , suaces and gravy on the 24th and the grandads always did the carving. the children set the table and cleared away and the men did the washing up
One tip is, if you are roasting anything do so in disposable foil dishes - on a baking sheeet for safety anf throw them afterwards' It's the one day in the year when being green takes a back seat.
Hope don't know if you heard the radio this morning, the head honcho of brussels sprouts growers said you must not waste time cutting crosses into the bottom of each one. Spoils them - mind you i can't say I ever have

Cooking for those you care about is the most profound expression of love - Anne-Sophie Pic