Solemnity or the Feast of the Immaculate Conception celebrates the belief in the Immaculate Conception of the Blessed Virgin Mary in the womb of Saint Anne.
It is universally celebrated on December 8, exactly nine months before the feast of Nativity of the Blessed Virgin Mary which is celebrated on September 8.
The Feast of the Immaculate Conception is mainly celebrated by the Roman Catholic Church and the day is the patronal feast day of countries like Spain, Korea, Portugal, Nicaragua, Brazil, the Philippines and the United States of America.
The Feast of the Immaculate Conception is the subject of a lot of misconceptions. By the name itself, many people believe have a misbelief that it is the day on which the conception of Christ in the womb of the Blessed Virgin Mary took place, but as you know that December 8 falls, 17 days before Christmas, hence it cannot be the associated with conception of Christ in the womb of the Blessed Virgin Mary.
The conception of Christ in the womb of the Blessed Virgin Mary is celebrated as Annunciation of the Lord on March 25, exactly nine months before Christmas.
The Feast of the Immaculate Conception is often celebrated with Holy Mass, parades, fireworks, processions, ethnic foods, and cultural festivities in honor of the Blessed Virgin Mary.
History of the day is like this – According to americancatholic.org, a feast called the Conception of Mary arose in the Eastern Church in the seventh century which later came to the West in the eighth century and in the 11th century it received its present name, the Immaculate Conception and in the 18th century it became a feast of the universal Church. Now it is recognized as a solemnity.