I had a similar christmas two years ago...
(Mrs Goth died Nov 20 2006. My urchins were 9, 7, 5 and 5 at the time)
...it was surprisingly bearable at the time, though I am glad we don't have to repeat it.
We went to my sister's house for it that year, which we had not done before and will not do again. It was just a thing we had to do to get us through that year, since then we are consciously trying to build our own 'new normal'.
..thing will be different for you as you are host. I would have found this difficult, but then I would find it difficult whether bereaved or otherwise!
Advice? Well, for what use it is I would say just do whatever you can to get through this year as unscathed as is possible. Give yourself some slack, even if you feel others are not doing so. Remember that however it seems most people are trying to help and be kind (even if you wish they would bloody well stop it) and try and let things that irritate drift past.
...in summary, remember that this year's Christmas is an excercise in survival. You can do it. I have faith.
this site may help. It did help me for sure.
Good luck and best wishes.