According to Vatican sources, Pope Francis will celebrate Mass at the Church of the Gesu (home Church of the Jesuits) in Rome on July 31. This is the feast day of Saint Ignatius of Loyola, founder of the Jesuit Order. Pope Francis will celebrate the closing Mass of World Youth day in Brazil on Sunday July 28th and is due back from World Youth Day on Monday, July 29. We do not have the details of the Mass yet (the time or whether it is open to the public) but will try to find out in the next few days.
If you are in Rome, whether this July 30th or any other time, we encourage you to visit the Gesu Church. In addition to its architectural beauty (the “domed” ceiling is not actually a dome, but is painted to look like one) you can also visit the rooms next door where Saint Ignatius lived out the last 17 years of his life.