HERNDON TASTE OF THE TOWN, sample food and beverages from more than 20 local restaurants; plus live entertainment, a silent auction and a live auction; sponsored by the Council for the Arts of Herndon, 5:30-9 p.m., Worldgate Centre, Worldgate Drive. $20. 703-689-9535.
HOMELAND SECURITY LECTURE, by Patrick M. Hughes, former director of the Defense Intelligence Agency, sponsored by Vietnam Veterans of America, 7:30 p.m., Neighbor's Restaurant, Cedar Lane Shopping Center, 262D Cedar Lane, Vienna. Free admission. 703-255-0353.
ROSE GARDENING TALK, Randy Scott discusses rosebush diseases and pest control, a meeting of the Potomac Rose Society, light refreshments, 7:30-9:30 p.m., McLean Governmental Center, 1437 Balls Hill Rd., McLean. Free. 301-869-4948.
VIRGINIA OPERA PERFORMANCE, Charles Gounod's "Faust," 8 p.m. Friday, 2 p.m. Sunday; discussion 45 minutes before each performance, George Mason University, Center for the Arts, Fairfax. $84, $68, $44. 703-218-6500.
ANNANDALE ORCHESTRA CONCERT, "Folk Music of the World," performed by the NVCC-Annandale Symphony Orchestra, 8 p.m., Northern Virginia Community College, Ernst Community Cultural Center, 8333 Little River Tpk., Annandale. $15; seniors and teenagers, $10; 12 and younger, free. 703-569-6580.
"PIPPIN," performed by the Vienna Theatre Company, 8 p.m. Friday, Saturday and April 29, 30 and May 6, 7, 13 and 14, 2 p.m. May 1, Vienna Community Center, 120 Cherry St. SE. $10; students and seniors, $9. 703-255-6360.
FALLS CHURCH 5K RUN, and one-mile fun run, to benefit J.E.B. Stuart High School athletic programs, 8 a.m., the school, 3301 Peace Valley Lane, Falls Church. 5K, $20; fun run, $5. 703-824-3900.
TRAIL WHEELCHAIR TOUR, a three-quarter-mile guided tour along a paved trail to a marsh overlook, for people who use wheelchairs, hosted by the U.S. Fish and Wildlife Service, 9 a.m., Joseph V. Gartlan Jr. Great Marsh Trail (meet in the trail parking lot), Mason Neck National Wildlife Refuge, Gunston Road, Mason Neck. Free; preregistration required. 703-490-4979.
FALLS CHURCH PORCELAIN ART EXHIBIT, hand-painted porcelain by area artists, china painting demonstrations, door prizes, sale of painting supplies, 10 a.m.-3:30 p.m., Falls Church Community Center, 223 Little Falls St. Free admission. 703-354-0271.
ANNANDALE EARTH DAY CELEBRATION, for all ages, a build-a-birdhouse workshop for children, musical performances, a climbing wall, a butterfly garden, an art contest, children's theater, a petting zoo, gardening tips, computer recycling, face painting, recycled-clothes fashion show and more, 11 a.m.-4 p.m., Northern Virginia Community College, 8333 Little River Tpk., Annandale. Free. 703-323-3223.
MASON NECK FESTIVAL, the Elizabeth Hartwell Eagle Festival, canoe tours, hayrides, guided hikes, live animal shows and more; food and beverages available from the Mason Neck Lions Club, noon-6 p.m., Mason Neck State Park, 7301 High Point Rd., Lorton. $10. 703-550-0960.
ALEXANDRIA PIANO CONCERT, sister-brother duo Christine and David Hagan, 4 p.m., Northern Virginia Community College, Rachel M. Schlesinger Concert Hall, 3001 N. Beauregard St., Alexandria. Free. 703-845-6252.
MCLEAN SYMPHONY CONCERT, with 14-year-old duo pianists Kristina Rudenko and Veronica Shalotenko, 4 p.m., Alden Theater, McLean Community Center, 1234 Ingleside Ave. $20; seniors and youths, $15; 12 and younger, $5. 703-790-0123.
FAIRFAX COUNTY BOARD MEETING, 9:30 a.m., Fairfax County Government Center, Board Auditorium, 12000 Government Center Pkwy. 703-324-3151.