TRIDENTINE MASS: The Roman Rite Mass, known as the “tridentine” or Latin Mass, will be offered at 12:30 p.m. Sunday at St. Stephen Church (Good Shepherd Parish), 1025 Napoleon Ave., in New Orleans.

The Good Shepherd Choir will be heard in the Missa Cantata, under the direction of Brian Morgan, director of music and principal organist, in the Gregorian “Missa de Angelis.” Phyllis Treigle will be soprano soloist, with Bart Folse as chanter.

For information, call the rectory office at (504) 899-1378.

ECUMENICAL PRAYER SERVICE: A Week of Christian Unity will be observed Sunday through Jan. 31. Featured will be an Ecumenical Prayer Service at 7 p.m. Monday at the Holy Name of Jesus Catholic Church, 6367 St. Charles Ave. Archbishop Gregory Aymond and Orthodox and Protestant clergy from throughout the greater New Orleans area will gather to pray for Christian unity. Guest homilist will be the Rev. Philip Latronico, of the Ecumenical and Religious Office of the Diocese of Newark, New Jersey. For information, call (985) 626-5671.

An ecumenical seminar, “Living Room Dialogues: Fifty Years of Ecumenism,” will be held 7:30 to 9 p.m. Tuesday at Loyola University’s Danna Center Audubon Room.

Guest speakers include Latronico ; the Rev. Susan Gaumer, of the Ecumenical Office of the Episcopal Diocese of Louisiana, retired; and the Rev. Dean Sunseri, lead minister of Voice of the Kingdom.

The week of ecumenism is held in memory of Jesuit priest the Rev. Donald Hawkins, a native of Mobile, Alabama, and a priest of the New Orleans Province of the Society of Jesus. He served as ecumenical and interreligious officer of the Archdiocese of New Orleans from 2009-13 and was active in ecumenical dialogue for more than 30 years.