holy days of obligation

Feasts with the obligation to celebrate Mass and rest as far as possible from servile work. There are ten such feasts for the universal Church, though certain countries are exempt from the observance of some of these

Suppressed feasts are not to be restored without permission of the Holy See. Thus in the United States, Epiphany, Corpus Christi, Saint Joseph, and Saints Peter and Paul, in England the feasts of Saint Joseph and the Immaculate Conception, in Ireland the feast of Saint Joseph, and in Australia the feasts of the Epiphany, Corpus Christi, Saint Joseph, Saints Peter and Paul, and the Immaculate Conception are not observed. Saint Patrick‘s is a holy day in Ireland. In the course of centuries feasts of precept increased, so that more than a hundred were observed in some countries. Pope Urban VIII in 1642 decreed the observance of 36. On all these, whether now observed or suppressed, pastors must apply Mass for their parishioners.