Feast of the Immaculate Conception St. Charles Borromeo 9 years ago Monday, December 8 Feast of the Immaculate Conception – Holy Day of Obligation Masses at 12:10 pm and 7 pm Share this: Feast of the Immaculate ConceptionDateDecember 4, 2015In relation toHoly DayImmaculate Conception – Friday 12/8 – Schedule ChangeDateDecember 2, 2017In relation toHoly DayImmaculate Conception – Thurs. Dec. 8: Holy Day of ObligationDateDecember 4, 2016In relation toHoly Day