Co-Cathedral of St. Joseph, Prospect Heights – Memorial Mass, Sept. 11 at 12 p.m. with Bishop Nicholas DiMarzio and performance of Mozart’s Requiem. For details, click here.

St. Matthias, Ridgewood — Memorial Concert, Sept. 11, 4 p.m. Choir will present Faure’s Requiem. Call 821-6447.

Knights of Columbus, Columbus Council No. 126, Marine Park — Sept. 11 Memorial Ceremony on Sunday, Sept. 11 at 7:30 p.m. in the grotto on the council’s grounds at 3501 Nostrand Ave.

St. Gregory the Great, Bellerose – 9/11 Memorial Service and Concert, sponsored by the choirs of St. Gregory the Great, and Our Lady of the Snows, N. Floral Park, Sept. 11, 3 p.m. at St. Gregory Church. Holy Hour of Remembrance with reflections on the “Seven Last Words from the Twin Towers” and sacred music. Free-will offering. Light refreshments.