We have fun Christmas Days (a treasure hunt for presents, etc;) and this is DD2's first proper birthday ifyswim- last year we went to the park and made some snowmen and then had a nice cake and went back out to the snow. We didn't invite people over as I was still new to the area and she had barely been at that nursery.
This year is different, there are 16 children coming, between 3-10 (but 6 of them are my relatives, and of those,four are between 8-10, and a further two unrelated children are between 7-10 and are siblings of an invited child).
I know the numbers because I've had to send out invitations now (due to people being away or whatever) and it is going t be the day before Christmas Eve.
Any ideas? We have a Rudolph theme- already got pin the tail on the Rudolph, and we are picking stuff from www.partypieces.co.uk/jingle-all-the-way.html but have no idea about the rest of it, especially ideas for party bags, games and food? So far have got rice crispie cakes with Rudolph faces, and maybe I could have a snowman competition if it snows. Also thought of craft stuff she likes- signs for Santa to come, a treasure hunt to find the party bags. And the dog would look fab dressed with reindeer antlers 
I'm just a bit blank. My other DC are born at sensible times!