Eternal font of sanctification and evangelization, the Traditional Latin Mass has became since Pope Benedict XVI’s motu proprio Summorum Pontificum 2007 the Extraordinary Form of the Roman Rite. Celebrated according to Saint Pope John XXIII’s 1962 edition of the Gregorian and Tridentine Missal, this liturgy gathers every year in Rome lay people, religious and priests for a 3-day pilgrimage culminating in a solemn procession through the streets of Rome and a High Mass at the Chair of St. Peter’s Basilica.