On the solemnity of the Dedication of the Basilica of Saint Peter the Apostle, Pope Leo XIV celebrates Holy Mass at 5 pm for the 4th centenary of the dedication of the Vatican Basilica, consecrated by Pope Urban VIII on 18 November 1626. It is the day after his return from the journey to South America. Announced in the Calendar of Liturgical Celebrations published on 27 October 2026 by the Office for the Liturgical Celebrations of the Supreme Pontiff.