What's Happening

BALL'S BLUFF BATTLEFIELD GUIDED TOURS, 11 a.m.-1 p.m. Saturdays and Sundays through October, Ball's Bluff Battlefield, Ball's Bluff Road, off Battlefield Parkway, Leesburg. Free. 703-737-7800 or http://www.nvrpa.org.

CLERK'S OFFICE TOUR, LOUDOUN COUNTY COURTHOUSE, Monday. Meet at 6:45 p.m. in the parking lot at Thomas Balch Library, 208 W. Market St., Leesburg, to walk to the courthouse. No one is permitted to enter restricted areas after 7 p.m. John Fishback will lead a tour and discuss the extent of Loudoun County's records holdings, where to look for records of births, deaths, marriages and deeds, and how to use these records in research. Free. 703-737-7195.

CIVIL WAR ROUNDTABLE, 7:30 p.m. second Tuesdays, Thomas Balch Library, 208 W. Market St., Leesburg. Free. 540-822-4480.

Lectures and Discussions

SMITHSONIAN NATURALIST CENTER LECTURE SERIES,"The Dead Zone of the Chesapeake Bay," 1-2:30 p.m. Oct. 11, Naturalist Center, 741 Miller Dr., Suite G-2, Leesburg. No children younger than 10. Free. 703-779-9712.

Music

LUCKETTS BLUEGRASS,7 p.m. Saturday, Lucketts Community Center, 42361 Lucketts Rd., Leesburg. Doors open at 6 p.m. Refreshments available. Music by Recent Addition and Norman Wright and the Travelers. $13. 703-771-5281 or http://www.luckettscommunitycenter.org.

BARBERSHOP HARMONY SOCIETY, Chorus of the Old Dominion, Loudoun County chapter, 7:30-10 p.m. Thursdays, Leesburg United Methodist Church, 107 W. Market St. Men interested in joining the chorus and guests are welcome. Free. 540-338-1201.

BLUEGRASS AND FOLK JAM, 6-11 p.m. last Fridays, Round Hill Arts Center, Old Furniture Factory, 6 W. Loudoun St. Door prizes. Public encouraged to participate. Food and beverages for sale. Free; donations appreciated. 540-338-5050, http://www.roundhillarts.org.

BLUEGRASS JAM, 7-8:30 p.m. Tuesdays, Morningside House, 316 Harrison St. SE, Leesburg. Open to musicians of all skill levels. Free. 703-779-4772.

Nature

BIRDING AT BLUE RIDGE, fourth Saturdays, Blue Ridge Center for Environmental Stewardship, 11661 Harpers Ferry Rd., Purcellville. Meet at 8 a.m., Neersville Volunteer Fire Station, Route 671. Free. 540-554-2542.

Seniors

HISTORY CLUB, 12:30 p.m. first Wednesdays, Leesburg Senior Center, 215 Depot Ct. SE. Discussion group covers current and historic events. Free. 703-737-8039.

CHESS CLUB, 6-9 p.m. Thursdays and 3-6 p.m. Saturdays, Carver Center, 200 Willie Palmer Way, Purcellville. All ability levels. Includes instruction. Drop-in, $1. 571-258-3400.

POTLUCK DINNER AND WHITE ELEPHANT BINGO, 5:30-7:30 p.m. third Thursdays, Leesburg Senior Center, 215 Depot Ct. SE. Take a covered dish to share and a white elephant gift, wrapped or in a gift bag. Free. 703-737-8039.