The Solemnity of the Immaculate Conception – 8 December
Solemnity of the Immaculate Conception celebrates the solemn belief in the Immaculate Conception of the Blessed Virgin Mary.
It is a Solemnity and is universally celebrated on 8 December, nine months before the feast of the Nativity of Mary, which is celebrated on 8 September. It is one of the most important Marian feasts in the liturgical calendar of the Roman Catholic Church, celebrated worldwide.