[quote="YoungTradCath, post:3, topic:292604"]
in fact, let's take that a step further and suggest that they keep all of the days mentioned in canon 1246, §1:
Canon 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.
(Dies dominica in qua mysterium paschale celebratur, ex apostolica traditione, in universa Ecclesia uti primordialis dies festus de praecepto servanda est. Itemque servari debent dies Nativitatis Domini Nostri Iesu Christi, Epiphaniae, Ascensionis et sanctissimi Corporis et Sanguinis Christi, Sanctae Genetricis Mariae, eiusdem Immaculatae Conceptionis et Assumptionis, sancti Ioseph, sanctorum Petri et Pauli Apostolorum, omnium denique Sanctorum.)