Mary as the Immaculate Conception is the Patron Saint of the United States.

Since December 8, 2019, is the Second Sunday of Advent, the Solemnity of the Immaculate Conception of the Blessed Virgin Mary is transferred to Monday, December 9, 2019. The obligation to attend Mass, however, does not transfer.

Find out more about the Solemnity of the Immaculate Conception here.