Choral Evensong for the Conversion of St. Paul, starting at 5 p.m., includes the “Mount St. Alban Service” by David Hogan, Responses of Philip Radcliffe and the Anthem of Herbert Howells, “Te Deum laudamus.” At 4:45 p.m. Music Director Dwight Thomas will play an organ prelude that includes the César Franck “Chorale No. 3 in A minor.”