In Polish tradition there is a beautiful custom surrounding Advent called roraty. It is a special early morning mass, before daybreak, devoted specifically to the Blessed Virgin Mary. The special name for this mass comes from the Introit, the opening antifon or Latin chant, Rorate Coeli, at the beginning of the mass. It was the prayer of the prophet Isaiah(45:8) begging the Lord for the arrival of a Savior.
The special Roraty mass will be celebrated every Saturday during Advent at 7 am.