Yes, yes, yes you should go Emmie.......nobody should spend Xmas day on their own. I tried once, a few years ago, and its ruddy miserable !
Get a nice bottle of Cava, or maybe Prosecco......much cheaper than Champagne. Prosecco should only a fiver, and it fun, just any other bubbly.
If you can stretch to it, buy a small bottle of brandy as well.....that way you can make bubbly cocktails for everybody :::
Put a sugar cube in the bottom of a tall glass....pour on a bit of brandy and then top up with Prosecco or Cava !