The solemnity which has been transferred to Monday, Dec. 9, is a holy day of obligation this year. Evening Masses on Sunday, Dec. 8, may be used to fulfill the Dec. 9 holy day obligation provided that you also attend a separate Mass to fulfill your Sunday obligation.
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This year, because the the solemnity of the Immaculate Conception of the Blessed Virgin Mary falls on the Second Sunday of Advent, it is transferred to Monday, Dec. 9.
In prior years, when the solemnity of the Immaculate Conception was transferred to a Monday, the obligation to attend Mass was waived. The Vatican has since offered clarification to the U.S. Bishops that even when this solemnity falls on a Monday the obligation to attend Mass remains.
Read more
Vatican: Holy days of obligation not dispensed if moved to a Monday (Catholic News Agency, Nov. 1)
8 things to know about the Immaculate Conception (National Catholic Register)
Solemnity of the Immaculate Conception: Read, reflect, pray, act (USCCB)
