Should you let guests know you're not cooking traditional Christmas Dinner

If I invite someone to a meal at anytime I give them an idea of what I'm serving. It means they don't have to sit and eat something they don't really like and I don't have to watch them do it.

Someone in our family invited a sibling and their young children for Christmas, and instead of cooking Christmas dinner, they all went out to a hotel for lunch. The children were quite young. I would have been horribly disappointed if I had been the guest-parent. I don't know or care who paid the bill; for me, Christmas Day with family is about preparing and sharing a noisy, messy feast in the comfort and privacy of your home, not sitting in a restaurant trying to keep your children quiet.

Not Christmas but New Years Eve.
My GD and I have been invited to her friend’s fathers house for New Years Eve Dinner.
I have been sent a link to an Indian takeaway away, quite expensive actually, to make my choice.
I do not like curry or anything spicy but will choose the mildest I can find so as to not offend.
Given the choice I would stay at home and have a duck breast or a nice steak.

Personally I think yes the host should have mentioned it at the time of inviting.
However, if it were me being invited, I’d happily go along - I’d value the company of friends/family above the meal - but I’d probably do the traditional Xmas dinner another day (although on a smaller scale than usual!)

I d love an Indian meal for Christmas dinner
Can’t the said lady have her traditional Christmas dinner for Boxing Day
Traditional can get a bit boring
I m going to a Christmas work meal and the only vegetarian option is a stuffed pepper and traditional vegetables not at all sure how that’s going to be, it doesn’t exactly float my boat

We are having seafood. If we were inviting anyone then I would make it clear what was intended. Personally I can't stand turkey, potatoes or sprouts though had to cook them for years to suit other people. Now we are on our own we have what we like best.

Yes I would. There are so many different ideas of what constitutes a Christmas dinner now.

I'm in two minds about it really. I think an informal comment about it not being the usual Christmas roast is OK. But I also think it's up to the host to serve what they want to cook/provide. There are plenty of other days to eat a traditional meal. Boxing Day?

For a while, our 'traditional' meal on Christmas Day was Mexican. I got bored with it after a while.

Yes, it’s good manners.

Yes I would as I wouldn't want them to be disappointed

Yes, I would, in case it was something they couldn’t eat. I’d be quite happy with Indian or vegan food though.