The Roman Catholic Archdiocese of Washington invites you to join us via Livestream as we observe a special Memorial Mass on Saturday, September 11, 2021, at 12:10 PM EDT to mark the 20th anniversary of the September 11, 2001, terrorist attacks in the United States of America. The Mass will have a particular focus on members of the Ancient Order of Hibernians who lost their lives that day. Wilton Cardinal Gregory, Archbishop of Washington, will serve as the principal celebrant and homilist from St. Patrick's Catholic Church in Washington, D.C., which is the oldest Catholic parish in the city.