What I thought was a decent read on the "birthday party" subject... I would tend to think that most midnight masses are sort of a birthday party, though.
I guess my issue is where Christmas is thought to ONLY be for Christians and people of faith. With it's beginnings built outside of Jesus and Christianity, I can't see it as being something exclusively for those that believe. It can mean lots of things to lots of people and not necessarily have anything to do with Jesus.
IMHO, Christmas is about spending time with friends and loved ones, and giving back... with or without any religious connotation.