Nativity is not a birthday. I don’t think Jesus was literally born on Dec 25th, thus christmas day is not Jesus birthday.
I was in this christmas party with non catholic christians. The singing leader suddenly decided that we sing “happy birthday” for baby Jesus. It was quite funny. Everybody sang “happy birthday” but we felt “something is wrong here somewhere”. Later I thought about it, I realized that happy birthday song was out of context, because christmas day is not Jesus birthday.
Anyway, I have not done anything for christmas. Not even put up a christmas tree. Last year I put up christmas tree in mid November, and took it down after newyear. I’ve just moved house and my house now is still in a mess. I still hope I will be able to put it up one or two days before 25th.