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Technically, the obligation is not transferred to Sunday. Rather, the obligation is supressed when the date occurs on a Saturday or a Monday, as is expressly permitted to the bishops’ conference under the approval of the Apostolic See by Canon 1246:How can you transfer the obligation to Sunday?. It is already obligatory to attend Mass on Sunday anyways.
I have grown so accustomed to this that I recently remarked to an acquaintance in the UK how odd it seems that in England and Wales the holy day itself is transferred to Sunday under those circumstances – But of course that is perfectly in line with the canon as well.Can. 1246 §1 The Lord’s Day, on which the paschal mystery is celebrated, is by apostolic tradition to be observed in the universal Church as the primary holyday of obligation. In the same way the following holydays are to be observed: the Nativity of Our Lord Jesus Christ, the Epiphany, the Ascension of Christ, the feast of the Body and Blood of Christ, the feast of Mary the Mother of God, her Immaculate Conception, her Assumption, the feast of St Joseph, the feast of the Apostles SS Peter and Paul, and the feast of All Saints.
§2 However, the Episcopal Conference may, with the prior approval of the Apostolic See, suppress certain holydays of obligation or transfer them to a Sunday.
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