In the afternoon of Sept. 25, Pope Leo will visit the headquarters of UNESCO, the United Nations Educational, Scientific and Cultural Organization. Late that night, Pope Leo will lead a prayer vigil with young people at the Stade de France in Saint-Denis. "He will meet the realities of Lourdes, and sick people are among the most important of them," Bishop Micas said of the papal visit. Pope Leo will celebrate Mass at the Cathedral of St. Stephen before a farewell ceremony at the airport and return to Rome. "The bishops of France invite all the faithful to pray for the arrival of Pope Leo XIV on the Feast of the Assumption," on Aug. 15.