The Feast of the Immaculate Conception is actually on December 8 but this year that is also the Second Sunday of Advent. The Feast of the Immaculate Conception will be celebrated liturgically on Monday, December 9, with Masses at 6:00 a.m., 8:00 a.m. and 5:30 p.m. There is not an obligation to attend Mass attached to this Feast Day in 2019.