On Thanksgiving evenings Mother and Dad would take us kids to downtown Atlanta to Rich's Department Store. As the sky grew dark, we'd stand in the street with the crowd waiting for the lighting of the Great Tree that sat on top of the five-story crystal bridge.
Choirs from Atlanta area stood on each bridge. The floors would light up one at a time and each choir would sing a familiar carol. For the finale, a soloist would begin to sing "O Holy Night". All the floors would light up at once and every voice would join in singing, "Fall on your knees. O hear the angels' voices. O night divine! O night when Christ was born". At that moment the huge tree would be lit and everyone down in the streets would gasp in delight.
After I was married and had kids, we started a tradition of turning on the lights of the Christmas tree at our house on Thanksgiving night.