The Immaculate Conception of the Blessed Virgin Mary is a Holy Day of Obligation.

People prepare themselves for this day by novenas (an act of devotion where a prayer is said for nine days) and nocturnal vigils. Special prayers and hymns are offered to the Virgin Mary. One of the most popular liturgical prayers said is Tota pulchra es. Inspired by words of praise from the book of Judith and Song of Solomon, the prayer glorifies the Virgin Mary’s holiness and beauty:

You are all beautiful, Mary.
and the original stain [of sin] is not in you.
Your clothing is white as snow, and your face is like the sun.
You are all beautiful, Mary.
and the original stain [of sin] is not in you.
You are the glory of Jerusalem, you are the joy of Israel, you give honor to our people.
You are all beautiful, Mary.