Oct. 11 Optional Memorial of St. John XXIII, pope , Opt. Mem. Brian Schoonover October 11, 2018 Saint of the Day Today is the feast of St. John XXIII, pope from 1958-1963, best known for convening the Second Vatican Council. He was beatified by Pope John Paul II on September 3, 2000. His feast is assigned to the day on which the first session of Vatican II opened in 1962. His feast is not on the General Roman Calendar, but can be celebrated locally.