Why is there a Christmas?

Answer 1

Christmas is not about getting gifts and money and that stuff. Its nice but not what it is about. here is the story:
A long time ago in country far away a little baby boy was born. This little baby boy was born to save the world. (a superhero in a bible story ha) His name was and is Jesus Christ. The birth of Jesus was very special. Wise men came and brought gifts. Angles sung above his crib which was only a manger. As this boy grew he taught people about His Father ( no not Joesph) Christmas is about The prophecy being fufilled. Jesus was born to save the world.
John 3:16
For God so loved the world that He gave His only son that who ever believes in Him will not perish but have everlasting life.

Answer:
Christmas is the continuation of celebrating the winter solstice present in many cultures. The "regifting" of the event by the early Christians was done to allow converts to continue to associate the end of December with a celebration. A "Christmas " celebration, if it were truly to be associated with the supposed birthday of the Christian's Jesus would more likely be held sometime between May and July.