Sunday, 11 a.m.: Music minister CJ Redden-Liotta leads the Chancel Choir at Vienna Baptist Church, local instrumentalists and guest soloists from George Mason University in a performance of Gabriel Faure’s “Requiem in D minor.” Vienna Baptist Church, 541 Marshall Rd. SW, Vienna. Free. 703-281-4400 or www.vbc-va.org.
Sunday, 3 to 6 p.m.: “Fall Fun Fest,” an intergenerational event, offers a chili cook-off, cobbler bake-off, “trunk or treat,” pumpkin decorating contest, moon bounce, games, refreshments and more. Bring nonperishable canned or boxed food for the homeless and families in need. Annandale United Methodist Church, 6935 Columbia Pike, Annandale. Free. 703-256-8330 or www.annandale-umc.org.
Sunday, 4 p.m.: Bishop Richard H. Graham of the metropolitan Washington Lutheran synod will preach at the annual Lutheran Reformation Service, a worship service observed in October in commemoration of Martin Luther’s posting of 95 theses on the door of the church in Wittenberg, Germany, a milestone in the Reformation. Washington National Cathedral, Wisconsin and Massachusetts avenues NW. Free-will offering. 202-537-6200 or www.cathedral.org.
Sunday, 4 p.m.: Soprano Lu-Hsuan Lucy Chen will perform with accompanist David Chapman. A reception follows. Paint Branch Unitarian Universalist Church, 3215 Powder Mill Rd., Adelphi. Free. 301-937-3666 or www.pbuuc.org.
Sunday, 4 p.m.: “Trunk or Treat,” in which costumed children collect treats as they pass by decorated car trunks in the church parking lot, will be held. The collected nonperishable food will be donated to Montgomery County food banks. Concord-St. Andrew’s United Methodist Church, 5910 Goldsboro Rd., Bethesda. Cost: Two nonperishable food items per trick-or-treater. 301-229-3383.
Sunday, 5 p.m.: Classical organist Nathan Laube performs. St. John’s Episcopal Church, Georgetown Parish, 3240 O St. NW. $30; students, $25. 202-338-1796.
Sunday, 7 p.m.: Mindy Rosenfeld and Ronn McFarlane will perform a concert of Renaissance, baroque and traditional Celtic music on flutes, fifes, harp and bagpipe. Resurrection Church, 3315 Greencastle Rd., Burtonsville. Suggested donation, $20. 301-520-8921.
Most weekdays, 10:30 a.m. and 1:30 p.m.: Behind the scenes cathedral tour, for ages 11 and older. See gargoyles and stained-glass windows and climb a lot of stairs to view the city from above. Washington National Cathedral, Wisconsin and Massachusetts avenues NW. $15. 202-537-6200 or www.nationalcathedral.org.