Immaculate Conception Day is a religious holiday that is celebrated on December 8 every year. This day celebrates the conception of the Virgin Mary in the womb of her mother, Saint Anne. Immaculate Conception Day is also considered one of the most important celebrations in the Roman Catholic Church’s Liturgical Year. The day is also known as the ‘Holy Day of Obligation’ and is celebrated with a Holy Mass. In addition, the day is celebrated with family meals, processions, and parades dedicated to the Virgin Mary’s honor. However, the day is not to be confused with the Annunciation of the Lord — the celebration of the appearance of the angel Gabriel to Mary and her willingness to accept the conception of Jesus Christ in her womb.