The Immaculate Conception of the Blessed Virgin Mary is usually a day of obligation. On Sunday, December 8, 2019 the Second Sunday of Advent is observed (Sundays of Advent outrank Solemnities of the General Calendar as per the Table of Liturgical Days (I2 and I3)). The celebration of the Solemnity of the Immaculate Conception is moved to Monday, December 9; however, although the rubrics of a Solemnity are in place, there is no obligation of the faithful to attend mass