In a forum I visited recently, someone said that Jesus never celebrated His birthday, neither did any of His disciples and the Bible bears no account of this. But since I've already dealt with reasons why I celebrate Christmas, I won't go into it again.
But let us suppose Jesus decided to celebrate His birthday, what are some things He might do? First of all, Jesus was a very sociable Person, and He was invited to many social gatherings. One that comes to mind is a dinner party at the home of Simon the leper where a woman came and broke an alabaster box of precious ointment and poured it on Jesus' head. Some of the guests felt it was a waste of money, but Jesus upbraided them. Read Mark 14: 1 - 8, Matthew 26: 7 - 13, Luke 7: 37 - 39. Then He took the opportunity to teach them a lesson on forgiveness.
What does this have to do with Christmas, you ask? Since Christmas is a social occasion, I believe Jesus would have got together with friends, He would have eaten and drank, and would have received gifts just as we do. However, I think Jesus would not have lost sight of His purpose even for a few moments. He would not have given in to drunkenness or revelry, but would have continued to speak about His Father and teach His listeners how to draw near to Him.
So if we are to be like Jesus, we should celebrate the way He would have celebrated, keeping our eyes on Him.