Xmas dinner side dish

[Candid]

I'm doing Xmas dinner this year for my large extended family. My kitchen is not very big so I want to cook with the minimum of fuss on the day.

Can anyone recommend a vegetable side dish that I can prepare the day before and just put in the oven on the day? I'm thinking of some kind of veggie bake?
I'm doing roast potatoes so it can't include potatoes.

James Martin's braised red cabbage, recipe is online :) it's even better with a day or two to mesh

Thanks. I'll have a look at that. Anything that can be done beforehand will be good!

Ratatouille? Not very traditional but easy to do in advance and just re-heat on the day.