I am not sure that anyone can tell you how best to cope with this loss at Christmas, although I do agree with @Alphabet1spaghetti2 that you should consider what Christmas looks like - if it isn't a big thing, then why make it one now?
That said, I am going to tell you a less positive story than many will. A neighbour lost her adult daughter 18 months or so ago - so two Christmas times ago. She was a wife and mother to a four year old. It was sudden, unexpected and she was tragically young. Her sister, now just 18, still lives at home. Her mum, my friend, has never recovered from it, but if I am being absolutely honest, she also hasn't tried. There has been no Christmas for two years. No birthday (for her) either. She goes to work, she looks after her granddaughter when she is off work. And that is it. She doesn't realise that she isn't seeing her other daughter. She goes through the motions of it, but her daughter knows it is a facade. She knows she doesn't love her any less than she ever did, but she also knows that it isn't enough to break through the grief. Recently her daughter tried to get her to go for a meal, just the two of them, on her birthday. Mum said no because it was still too soon...The fact is that in her mind I think it will always be "too soon", and life is passing her by. And her daughter doesn't know how to tell her any of this, so she tells me.
Whilst being terribly sorry for your loss, my advice is not to put your life on hold, because once you do it will be hard to get it back. There will be enormous sadness and grief. There is also the memory of so many good things and good times, and some people are never that lucky to have anything like that. Whether it is carrying on with loved traditions, or creating entirely new ones, is something only you and your child can work out - and you may make some mistakes and misjudgements about what that is too. But don't turn away from living life. That isn't what you husband would have wanted for his family.