I don't want to be a Debbie Downer but I felt like this at the same time last year. Couldn't wait for baby's first magical Christmas. He was 10m as well. I bought the outfits, new jammies, all the my first Christmas stuff... Tbh it was a nightmare!
he had the aforementioned obligatory First Christmas Cold, he didn't understand or care about his carefully chosen and wrapped gifts, he whinge and moaned all day, we were busy trying to cook, entertain, sort our own gifts and other family gifts... He just wanted to get on with a normal day of playing, eating at his usual times, napping and crawling around destroying the house, emptying drawers, trying to touch the cooker, screaming when mummy left the room etc etc as 10m olds do.
I was really upset because I was so stressed. I'd put so much pressure on us to have a totally perfect day and it was incredibly stressful for all involved.
The moral of my long whinge is - I hope you have an absolutely lovely day. Just don't have too many expectations and whatever you're planning to do in terms of cooking, entertaining etc, pare it back as much as you can! Merry Christmas! 
PS this year he is 22 months and I've got it into my head that this year will be the perfect year... I never learn!