How bout going on holidays? You're tradition could be that you go away for Christmas?
A couple of years ago after my divorce I went to Thailand with a gf for Christmas and there were stacks of families there too. The atmosphere is great. It's such a buzz. You can make it as full on as you like - I wore a mrs Santa suit for the Christmas lunch. They do Christmas decor and Christmas parties etc
And there will be other kids there too.
(Doesn't necessarily have to be overseas if the budget doesn't permit but most 'holiday' places make a big deal about Christmas)