Dale City farmers market, 8 a.m.-1 p.m., Dale City Commuter Lot, behind Center Plaza Shopping Center, Dale Boulevard. 703-670-7112, Ext. 227, www.pwcparks.org.
“Wicked Georgetown: Scoundrels, Sinners and Spies,” historian and tour guide Canden Schwantes discusses her book. 2 p.m., Manassas Museum, 9101 Prince William St., Manassas. Free. 703-257-8453.
Ballroom dancing, waltz lessons followed by music and dancing. 3:30-6 p.m., Candy Factory, Kellar Theater, 9419 Battle St., Manassas. Lesson and dance, $15; open dance, $10. 703-330-2787 or www.center-for-the-arts.org.
Concert and ice cream social, music by the Sam ’O Reggae Band, followed by an ice cream social. Bring lawn chairs. 3-4:30 p.m., Loy E. Harris Pavilion, 9201 Center St., Manassas. Free. 703-361-9800.
“9/11: We Remember,” features an I-beam from the World Trade Center, a Pentagon building fragment and other items in commemoration of the anniversary of Sept. 11, 2001. 9 a.m.-5 p.m. daily, National Museum of the Marine Corps, 18900 Jefferson Davis Hwy., Triangle. Free. 877-635-1775.
“Enduring Legacy: Liberia Plantation 1825-2013,” an exhibit detailing the history of the plantation. 10 a.m.-5 p.m. Tuesdays-Sundays, Manassas Museum, 9101 Prince William St., Manassas. $5; seniors and children, $4; Baldwin students and their families, free. 703-368-1873.
“Now and Then,” an exhibit of oil paintings and sketches by Steve Myles of Oakton and woodturning and woodburning by Bob Horowitz of Falls Church. 11 a.m.-5 p.m. daily, through Aug. 5, Artists’ Undertaking, 309 Mill St., Occoquan. Free. 703-494-0584.
Bristoe Station Battlefield guided tours, learn about two Civil War battles that took place at the site in 1862 and 1863. 11 a.m.-3 p.m. second and fourth weekends of each month. Tours leave on the hour, Bristoe Station Battlefield Heritage Park, 10708 Bristow Rd., Bristow. Free. 703-366-3049 or www.pwcgov.org/historicsites.
“Escapes,” Jackie Perry exhibits her paintings of places and objects that provide moments of escape. 11 a.m.-4 p.m. Tuesdays-Fridays, 11 a.m.-5 p.m. Saturdays and noon-5 p.m. Sundays, through Aug. 4, Loft Gallery, 313 Mill St., Occoquan. Free. 703-490-1117.
“Near and Far,” an exhibit by local photographers. 10 a.m.-5 p.m. Mondays-Fridays, 1-5 p.m. Saturdays, through July 31, Center for the Arts, Caton Merchant Family Art Gallery, 9419 Battle St., Manassas. 703-330-2787 or www.center-for-the-arts.org.
“Space Jam,” bring a snack and watch the feature film. 11 a.m., Potomac Community Library, 2201 Opitz Blvd., Woodbridge. Free. 703-494-8126.
Random Reads book club, a discussion of “The Secrets of Mary Bowser” by Lois Leveen. 1 p.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. Free. 703-792-4530.
Lake Jackson Mid-County Lions Club meeting, 6:30 p.m., Hibachi Buffet and Sushi, 8121 Sudley Rd., Manassas. 703-791-5227.
Crochet Guild meeting, 7-9 p.m., Manassas Church of the Brethren, 10047 Nokesville Rd., Manassas. 571-247-1868.
Prince William Wildflower Society, Charlie Grymes discusses the geology of Prince William County. 7:30 p.m., Bethel Lutheran Church, 8712 Plantation Lane, Manassas. 703-368-2898.
Jay Mattioli: Reading Is Magic, age 6 and older, a show combining magic, comedy and audience participation. 3 p.m., Central Community Library, 8601 Mathis Ave., Manassas. Free, registration required. 703-361-8211.
Friends of Leesylvania monthly meeting, 7:30 p.m., Leesylvania State Park, 2001 Daniel K. Ludwig Dr., Woodbridge. 703-583-6904 or firstname.lastname@example.org.
Grey Seal Puppets, “A Tangle of Tales.” 10:30 a.m., Central Community Library, 8601 Mathis Ave., Manassas, 703-361-8211. 2 p.m., Bull Run Regional Library, 8051 Ashton Ave., Manassas. 703-792-4530. Free.
National Active and Retired Federal Employees, Chapter 356. Lunch, 11:30 a.m.; meeting, 12:30 p.m. Hibachi Buffet and Sushi, 8121 Sudley Rd., Manassas. 703-361-4677.
English Conversation Club, new speakers of English practice their skills. 11 a.m. and 7 p.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. 703-792-4800.
Job search network group, 6-7:30 p.m., House of Mercy, 8170 Flannery Ct., Manassas. 703-659-1636.
Lake Ridge Toastmasters Club, Lake Ridge Club 8913. 7:30 p.m., Tall Oaks Community Center, 12298 Cotton Mill Dr. $62 membership fee. 703-491-3020.
Manassas farmers market, 7:30 a.m.-1 p.m. Thursdays, Loy E. Harris Pavilion, 9201 Center St. 7:30 a.m.-1 p.m., Parking Lot B, West Street (next to the train station visitors center). 703-361-6599 or www.visitmanassas.org.
Grey Seal Puppets, “A Tangle of Tales.” 10:30 a.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. 703-792-4800. 2 p.m., Potomac Community Library, 2201 Opitz Blvd., Woodbridge. 703-494-8126. Free.
National Active and Retired Federal Employees meeting, Woodbridge Chapter 1270. 11:30 a.m., Holiday Inn Quantico Center, 3901 Fettler Park Dr., Dumfries. Free; lunch, $15; reservations required. 703-499-8902.
Castleton Festival Orchestra and Singers, “Mostly Mahler” showcases lyric soprano Jennifer Black in a program that includes Mahler’s lyrical Symphony No. 4 and Mendelssohn’s Symphony No. 5 (“The Reformation”). 8 p.m., Hylton Performing Arts Center, 10960 George Mason Cir., Manassas. $30-$60. 703-993-7759 or www.hyltoncenter.org/castleton.
Spanish chat, bring lunch and practice speaking Spanish. Noon-2 p.m., Central Community Library, 8601 Mathis Ave., Manassas. 703-361-8211.
Gainesville farmers market, 2-6 p.m. Thursdays, Marque at Heritage Hunt, 13550 Heathcote Blvd., Gainesville. 703-754-7711.
American Business Women’s Association meeting, preparing a business plan. 11:30 a.m., Stratford University, 14349 Gideon Dr., Woodbridge. Lunch, $15. 703-986-0205.
Business Women of Prince William County, a monthly networking meeting featuring roundtable discussions, a brief program and a 50/50 raffle. 11:30 a.m.-1 p.m., Giorgio’s Family Restaurant, 4394 Kevin Walker Dr., Montclair. Attendees pay for lunch. 910-389-5771, 703-369-6717, email@example.com or firstname.lastname@example.org.
Manassas Park farmers market, 3-7 p.m., Manassas Park City Hall, 1 Park Center Ct. 703-335-8800.
Occoquan farmers market,8 a.m.-noon, Mill Street parking lot, next to Route 123 bridge, Occoquan. 703-491-1918.
Pringle House Hospital Weekend, to commemorate the 152nd anniversary of Ben Lomond being used as a Civil War hospital, the site will host medical demonstrations by living historians and specialized tours. 11 a.m.-4 p.m. Saturday-Sunday, Ben Lomond Historic Site, 10321 Sudley Manor Dr., Manassas. $5. 703-367-7872 or www.pwcgov.org.
Vineyard photography walk, bring a camera and join photographer Leanne Wood as she leads a walk on the grounds. 2 p.m., Winery at La Grange, 4970 Antioch Rd., Haymarket. $10, reservations required. 703-753-9360.
Canoe tour, a ranger leads a guided tour on Powell’s Creek. 11 a.m., Leesylvania State Park, 2001 Daniel K. Ludwig Dr., Woodbridge. $9, registration required. 703-583-6904.
Linda Lay and Springfield Exit, bring a blanket, lawn chair and picnic for the bluegrass and traditional folk music concert, part of the Center for the Arts SummerSounds Concert series. 6:30 p.m., Loy E. Harris Pavilion, 9201 Center St., Manassas. Free. 703-361-9800.
— Compiled by Sarah Lane