Holy Day of Obligation - Immaculate Conception

In the past, when the Solemnity of the Immaculate Conception fell on a Saturday, Sunday, or a Monday, it was abrogated, which means it is no longer a Holy Day of Obligation, but it remains a Solemnity of the Church.

There has been a new ruling from the Dicastery in Rome on this matter, which came out mid-October after everyone had already published their Ordo Calendars and Ordo Books, which fundamentally stated that when Immaculate Conception is transferred to a Monday, the obligation to attend is also transferred along with the solemnity, which means that it is in fact a Holy Day of Obligation.

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/documents/2024/12/memorandumimmaculateconceptionholydayobligatio.pdf