<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The Feast of the Immaculate Conception celebrates the solemn celebration of belief in the Immaculate Conception of the Blessed Virgin Mary . It is universally celebrated on December 8, nine months before the feast of the Nativity of Mary, which is celebrated on September 8 . The Immaculate Conception is one of the most important Marian feasts in the liturgical calendar of the Roman Catholic Church, and is celebrated worldwide . </P> <P> By Pontifical designation and decree, it is the patronal feast day of Argentina, Brazil, Korea, Nicaragua, Paraguay, Philippines, Spain, the United States and Uruguay . By royal decree, it is also designated as the Patroness of Portugal . It is celebrated by the Roman Catholic Church as well as a few other closely related Protestant Christian churches, but not by the Eastern Orthodox Church, the Oriental Orthodox Church, or the non-Catholic branches of the Church of the East . </P>

What is the significance of the feast of the immaculate conception
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