Well this is interesting, the Catholic Church can 'abrogate' its Holy Days when it fits them, it seems even Sunday. It seems that in the US, the the U.S. Conference of Catholic Bishops (USCCB) stipulates that when certain feast days fall on a Saturday or Monday, the obligation to attend Mass on that day is ?abrogated.? So if you look in the dictionary it means 'To abolish:
Abrogated means to abolish by authoritative, official, or formal action1. It is the past simple and past participle of the verb "abrogate"2. The verb "abrogate" means to end a law, agreement, or custom formally3'...

They have set up Holy Days of obligation of which Sunday is a part as we see.

"The Catechism of the Catholic Church explains holy days of obligation this way:

On Sundays and other holy days of obligation, the faithful are to refrain from engaging in work or activities that hinder the worship owed to God, the joy proper to the Lord?s Day, the performance of the works of mercy, and the appropriate relaxation of mind and body.

Family needs or important social service can legitimately excuse from the obligation of Sunday rest...

The Code of Canon Law spells out when the holy days of obligation are on the Church?s universal calendar:

Can. 1246 ?1. Sunday, on which by apostolic tradition the paschal mystery is celebrated, must be observed in the universal Church as the primordial holy day of obligation. The following days must also be observed:

the Nativity of our Lord Jesus Christ,
the Epiphany,
the Ascension,
the Body and Blood of Christ,
Holy Mary the Mother of God,
her Immaculate Conception,
her Assumption,
Saint Joseph,
Saint Peter and Saint Paul the Apostles,
and All Saints.
These ten are the exact holy days of obligation that are celebrated in Vatican City, but there is variation elsewhere (including in Italy). The reason is that the Code of Canon Law goes on to state:

Can. 1246 ?2. With the prior approval of the Apostolic See, however, the conference of bishops can suppress some of the holy days of obligation or transfer them to a Sunday."

So the Pope can allow it to be 'abrogated' or 'suppressed' and that became a issue this month on Dec. 8 which is typically a holy day of obligation celebrating the solemnity of the Immaculate Conception, but this year the feast day lands on a Sunday in Advent. As a result, the USCCB transferred it to Monday, Dec. 9, according to the 2024 USCCB liturgical calendar.

Here is the full article...
https://www.catholicnewsagency.com/...not-dispensed-if-transferred-to-a-monday

Last edited by Rick H; 4 hours ago.