Why do we celebrate Christmas?

If you ask Josh why we celebrate Christmas, he will tell you: "Because Jesus was boring", with total confidence. I tried and tried to tell him it's born not boring, but it wouldn't stick.

Not only that, but when my kids sing that song "I will go, I will do..." They sing "I will go, I will do, the things the Lord ask of me". I can't them to convert to "the things the Lord commands. Oh well.