Each year, since 2012, the Cœtus Internationalis Summorum Pontificum gathers in Rome faithful and priests from around the world who are devoted to the extraordinary form of the Roman Rite (the Latin and Gregorian mass, celebrated according to the 1962 missal of Saint John XXIII) to show their desire to take their part for the new evangelisation. During three days, with the assistance of the personal parish of Most Holy Trinity of the Pilgrims, the participants become witnesses of the eternal youth of the traditional liturgy. On Saturday, after an Eucharistic adoration and a procession through the streets of the Eternal City, a solemn Mass is celebrated in the Basilica of Saint Peter. The celebrant for 2012 was Cardinal Cañizares Llovera, prefect of the Congregation for Divine Worship, whereas in 2013 it was Cardinal Castrillón Hoyos, prefect emeritus of the Congregation for Clergy, and Cardinal Burke, then Prefect for the Apostolic Signatura, in 2014.
In 2015, Mass in St. Peter’s has been celebrated on Saturday the 24th of October by Bishop Laise, ofm cap, emeritus of San Luis (Argentina) while the sermon was delivered by Abp. Negri of Ferrara-Comacchio (Italy).
The pilgrimage is placed under the protection of St. Philip Neri.