I'm in Australian, so it's a Christmas lunch here, and it's in summer, so far too warm for a traditional roast.
We typically do a ham, seafood (it's a big thing in Australia to go to the fish markets very early on Christmas Eve or Christmas Day to stock up on the freshest, best seafood), potato salad, pasta salad, other salad, fresh bread and butter, obviously pavlova for dessert, and there will always be a Christmas pudding because the oldies insist on it (and no one else eats it).
Sometimes we do a BBQ instead - very laid back. Sausages, steak, chicken kebabs etc. on the bbq, fruit salads, pasta salad, bread and butter, onions etc. The usual Australian bbq affair. Get the slip n' slide out in the backyard, don your thongs and sunscreen and relax.
I love a summer Christmas, honestly.