The way we celebrate Christmas… with lights on trees, sharing gifts, carols with loved ones… is a mix of different traditions, and its present form is surprisingly recent! All traditions go back to Winter Solstice festivals… the hopeful celebration of the power of light in darkness, and the return of life after death and darkness.
History of Christmas
History of Santa Claus
History of Winter Solstice
Christmas and Consu
Historical Details in the Nativity Video, Book of Mormon Central