Thanks for all the replies, it's given me lots to think about.
I think I'll probably go for
1 huge winter berry pavlova
1 big tray bake - choc based
These are both easy to do in advance
A big crumble is also a great idea but I take on board what PP have said about oven space and the madness in the kitchen.
So it'll either be another pav or maybe a lemon tart or something like this.
I like the idea of a dessert station with mini meringues, cream, ice cream, sprinkles etc but really I think with the number of people it may end up as carnage.
To give further context, this is the first year MiL will have all her family (her descendants!) in the same country for Christmas and is absolutely INSISTENT that we spend Christmas Eve together. She has 7 children! We are in France so eve is the big day really. Not one member of the family has a house big enough for that many people but we will be making do
. Everyone will be bringing their own cutlery etc, it's going to be chaotic but lovely I'm sure. As I mentioned though, it's alcohol free and I might be needing IV wine by the time I get home. A few of us have looked into an Airbnb for the day but MiL doesn't want that, so it'll be hosted at one of my BiL house.
One branch is bringing 'toasts' (salmon, foie gras pate, etc)
One is bringing the fromages
One bringing the meat while MiL does the sides etc
Two branches are travelling in that day so are off the hook
But generally everyone is playing a role.
Tbh I don't know how I, the only English member of the family, got stuck with dessert because the French are soooooooo good at that. Should've given me spuds!
And I know I said I'm not a fan of trifle but I'm having second thoughts now because actually that would be an easy make ahead choice AND it's typically British so maybe it'd be appreciated by them?