@KateF firstly - dont WORRY about it, especially not now. Think calmly and plan. What are the normal events that you go to over the festive period? Which one do you cater for? Are there some where othre people are in charge? Only you know the relationships, the demands, the opportunities to influence..
I'm fortunate in that I have a quiet social life! And I'm quite assertive about offering to bring food to other people's events. Who would object to canapes of home-made prawn cocktail on little cups of lettuce, or cream cheese wrappin smoked salmon, or mini cheese and almond muffins, or tiny lamb meatballs with a (full fat) yogurt dip? Then I find that I've filled up so much on LCHF canapes that I'm not tempted by the yorkshire puddings or bread sauce, let alone the pudding.
Or I offer to bring dessert and make tiny decadent (rich) chocolate mousse with cream. Maybe some berries and cream / yog mix, plus something sickeningly sweet that other people love and I wont touch.
On Christmas day itself, I don't bother too much, but I'd have a breakfast of scrambled agg and smoked salmon (not bacon rolls). I'd eat one or two roast potatoes, and really enjoy them, but I'd not pile my plate with them. If I was in charge I'd have lots of veg choices, mashed celeraic, cauli cheese... I'd have a cheese course (with grapes, celery, nuts, maybe a grape or two) and either no bread / biscuits, or one of the low carb alternatives, SLC rolls, the keto rolls (which are amazing), almond muffins, or schneiderbrot (4g carb pers slice). Who needs Christmas pud after that?
I pick and choose either which events I attend or which events I go off-piste at. If I'm out with a group of 30 at a bog-standard Christmas party meal I'd probably eat LCHF before so that I didn't stuff my self with bread during the inevitable hours-long wait. I'd be 'picky' with what I ate, and just no to cheap, sweet unsatisfying pudding. I'd drive so I didn't feel under pressure to drink. However, an intimate lunch in a lovely place with a couple of my closest girlfriends would be different. But I'd always try to influence the choice to restautrant to go somewhere where I really felt indulged by eating the low carb choices.
Key thing for me is to choose a couple of events / days like that, and not to just go 'woo-hoo it's Christmas' for 4 weeks.
Then stuff your freezer with great soups, all the low carb M&S / Waitrose mini dishes you can find, pigs in blankets, pates, mini portions of curry then lock your freezer so the rest of the family don't take them Buy some low carb snacks - cheesies, seaweed crisps - for when you need an alternative to potato crisps. And a few bags of salad, some eggs, some ham, some meat loaf...
Reading that all back I wish it could be Christmas, every day 