This year the Solemnity of the Immaculate Conception will be transferred to the Monday since Sunday is Advent and it will be a Holy Day of Obligation Monday, December 9th.
The Mass Schedule is as follow:
Monday, December 9th
6:45AM, 9:00AM,
12:30PM, 5:30PM & 7:30PM
The Solemnity of the Immaculate Conception
by Fr. Matthew Ernest,
Director of the Office of Liturgy for the Archdiocese of New York
The Solemnity of the Immaculate Conception has long held a significant place in the annual cycle of the Church’s liturgical year. As early as AD 700, a feast dedicated to the “Conception of Mary by Saint Ann” was celebrated in the East on December 9. This commemoration was thought to have been initially inspired by the non-canonical Protoevangelium of James, which described the events surrounding Saint Ann’s conception of Holy Mary, despite the former having been thought barren due to her advanced years. December 9 was chosen as the day for this commemoration as it fell nine months prior to September 8, the day on which the birth of Mary was celebrated by the Eastern Church.
In Rome, a similar feast began to be celebrated in the 15th century, albeit with special focus on the Blessed Mother’s Immaculate Conception. This dogma was initially the subject of debate amongst scholastic authors, some of whom questioned how Mary could be conceived without sin prior to the events by which her Son redeemed humanity. Blessed John Duns Scotus (d. 1308) is credited with developing the Church’s theological understanding of the Immaculate Conception of Mary as “preservative redemption.” This belief was later dogmatically defined in 1854, when Pope Pius IX formally declared that Mary “was by a singular grace and privilege of Almighty God, and in view of the merits of Jesus Christ, Savior of the human race,
preserved free from all stain of original sin” (Ineffabilis Deus). The title of Holy Mary as “the Immaculate Conception” was again affirmed a few years later within the Marian apparitions in 1858 to Saint Bernadette at Lourdes, France, where Our Lady declared herself to be the Immaculate Conception. …
Our Lady under the title of the Immaculate Conception has also been the patroness of the United States since 1846, when the US bishops placed the entire country, and not only the Church in the United States, under her care at the Sixth Provincial Council of Baltimore.
For many years, the understanding in the United States was that, when the date of
the Solemnity of the Immaculate Conception was transferred in a particular year, the obligation to attend Mass on this day did not also transfer. However, more recently, Bishop Thomas J. Paprocki, Chairman of the USCCB’s Committee on Canonical Affairs and Church Governance, wrote to the Holy See seeking clarification on the
obligation to attend Mass when a holy day of obligation in Advent, Lent, or
Easter falls on Sunday and the Solemnity is transferred to Monday. In a letter to the US bishops dated October 10, 2024, Bishop Paprocki communicated the Dicastery for Legislative Text’s response: “the feast must be observed as a day of obligation on the day to which it is transferred.” In light of this new directive, the Solemnity of the Immaculate Conception on Monday, December 9, 2024 is to be observed as a holy day of obligation this year and in all future years when the celebration is transferred to Monday.…one may satisfy this precept for the Sunday of Advent at any Mass from 4pm on Saturday, December 7 through midnight of Sunday, December 8. The obligation to attend Mass on the Solemnity of the Immaculate Conception can be fulfilled at any Mass from 4pm on Sunday, December 8 (irrespective of the Mass texts used) through midnight on Monday, December 9. In the latter case, attending Mass on Monday, December 9 would be more ideal, bearing in mind the given opportunity to hear the readings and prayers associated with this beautiful Solemnity dedicated to Our Lady.