Priests and those groups that receive permission from the Archbishop of Chicago to celebrate the Mass using the Missal of 1962, are bound on the first Sunday of the month to celebrate Mass only using the Missal of Paul VI. Additionally, all celebrations of the church’s liturgies on Christmas, the Triduum, Easter Sunday, and Pentecost Sunday are to use exclusively the liturgical books promulgated by St. Pope Paul VI and St. Pope John Paul II, either in the vernacular or in Latin, and ordinarily “versus populum,” unless permission is granted otherwise by the archbishop. All other sacraments are to be celebrated using the liturgical books promulgated by St. Pope Paul VI and St. Pope John Paul II. These rites may be celebrated in Latin.