“Operation Urgent Fury: Invasion of Grenada,” an exhibit featuring photographs and artifacts chronicling the multinational invasion of the island of Grenada. 9 a.m.-5 p.m. daily, National Museum of the Marine Corps, 18900 Jefferson Davis Hwy., Triangle. Free. 877-635-1775.
St. Francis Earth Day, presentations by the Virginia Department of Environmental Quality, Prince William County Department of Public Works and the Virginia Cooperative Extension Master Gardeners, resources, displays and vegetarian food. The parish school will collect printer cartridges for recycling. 9 a.m.-1:30 p.m., St. Francis of Assisi Catholic Church, 18825 Fuller Heights Rd., Triangle. Free. 703-221-4978.
“Anything Goes,” an exhibit featuring photography and digital paintings by David and Jane Ernst of Springfield and fused glass by David and Dale Barnes of Sterling. 11 a.m.-5 p.m. daily, through May 5. Artists’ Undertaking, 309 Mill St., Occoquan.
Pollinator Garden Planting, bring work gloves and help pull weeds and plant host and nectar plants for a garden that will be registered as a Monarch Way Station. 11 a.m.-1 p.m., Leesylvania State Park, 2001 Daniel K. Ludwig Dr., Woodbridge. Free. 703-583-6904.
“Duets Four,” in their fourth collaborative exhibit, painter Susan Lawrence Norman and sculptor Gwen Harrison Lockhart each use a classical approach that complements the other’s work. 11 a.m.-4 p.m. Tuesdays-Fridays, 11 a.m.-5 p.m. Saturdays and noon-5 p.m. Sundays, through next Sunday. Loft Gallery, 313 Mill St., Occoquan. Free. 703-490-1117.
Dog Walk for a Dog Park, a 2.75-mile walk to support improvements to the K-9 Gunner Memorial dog park, sponsored by Prince William County Dogs, Prince William Trails and Streams Coalition and Prince William Parks and Recreation. Noon, Lake Ridge Park, 12350 Cotton Mill Dr, Woodbridge. $5 per dog, registration required. 703-627-1016 or www.pwcdogs.com.
Spring Native Garden Tour, the Prince William Wildflower Society sponsors the tour of two gardens that highlight the use of native plants. Noon-5 p.m. Brown-Macdonald Garden, 10655 Big Oak Cir., Manassas and Boone Garden, 11351 Occoquan Oaks Lane, Woodbridge. Free. 703-368-2898.
Author Laura Murray, meet the author of “The Gingerbread Man Loose in the School” and “The Gingerbread Man Loose on the Fire Truck.” 2 p.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. Free. 703-792-4800.
Author Robert Plumb, a discussion of his book “Your Brother in Arms: A Union Soldier’s Odyssey.” 2 p.m., Manassas Museum, 9101 Prince William St., Manassas. Free. 703-368-1873.
Bingo, proceeds support local veterans. 2 p.m. Sundays, 7:15 p.m. Mondays, Woodbridge American Legion, 3640 Friendly Post Lane, Woodbridge. $10 minimum. 703-494-4304.
New Dominion Choraliers, the group performs “Pirates of Penzance and Other Treasures,” selections from Gilbert and Sullivan’s musical along with Broadway tunes. 3:30 p.m., Gar-Field High School, 14000 Smoketown Rd., Woodbridge. $15; seniors and students, $10; children 5-13, free. 703-590-2147 or www.newdominionchoraliers.org.
Young Life dinner, ages 18 and older are invited to dinner with Young Life staff members, volunteers, committee members, and middle and high school students to learn about and support the Christian-based ministry. 5:30 p.m., Piedmont Club, 14675 Piedmont Vista Dr., Haymarket. Free, donations accepted. 877-438-9572 or www.younglife.org.
Brit Lit book club, a discussion of “Cuckoo’s Calling” by Robert Galbraith, J.K. Rowling’s pen name. 1 p.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. Free. 703-792-4800.
Job search network group, plus discussion of various topics related to the search process. 1-3 p.m. Mondays, House of Mercy, 8170 Flannery Ct., Manassas. Free. 703-659-1636.
Building the Brain, a presentation by motivational speaker Mark Finley, sponsored by the Manassas campus iCAD initiative. 7 p.m., Northern Virginia Community College, 6901 Sudley Rd., Manassas. Free. 703-323-3000.
“The Musical of Musicals (The Musical!)” auditions, actors will perform a short dance routine and be prepared to sing a 2-3 minute song not from the show. The Prince William Little Theatre production runs July 18-27. 7-9 p.m., Grace United Methodist Church, 9750 Wellington Rd., Manassas. PWLT membership, $15; production fee, $25. 703-330-7796 or www.pwlt.org.
Prince William Community Band, rehearsal, for musicians 19 and older, no auditions necessary. 7:30 p.m., Saunders Middle School, 13557 Spriggs Rd., Manassas. Free. 703-791-4119 or www.pwcb.org.
“Intersections of Art and Life,” the exhibit features works from William Woodward’s “Seven Deadly Sins Series” and still-life paintings by Becky Parrish. 10 a.m.-6 p.m. Tuesdays-Wednesdays, Fridays-Saturdays, 10 a.m.-8 p.m. Thursdays, through May 24, Hylton Performing Arts Center, 10960 George Mason Cir., Manassas. Free. 703-993-7759.
NOVA Novel book club, the group discusses “The World We Found” by Thrity N. Umrigar. 7:30 p.m., Chinn Park Regional Library, 13065 Chinn Park Dr., Woodbridge. Free. 703-792-4800.
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. Free. 703-792-4800.
Identity theft discussion, Courtney Sweeney, Wells Fargo asset management, will give tips on how to prevent identity theft. 1:30-2:30 p.m., Westminster at Lake Ridge, 12191 Clipper Dr., Lake Ridge. Free. 703-496-3440 or www.wlrva.org.
Lake Ridge Toastmasters Club, an open house for 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., and 7:30 a.m.-1 p.m. Saturdays, Parking Lot B, West Street (next to the train station visitors center). 703-361-6599 or www.visitmanassas.org.
“Collaborative Printmakers,” a presentation by photographer Erwin Thamm, co-founder of the GMU Printmakers Guild, and Patrick Sargent, who began printmaking in 2002. 10 a.m.-5 p.m. weekdays, 1-5 p.m. Saturdays, through June 5, Center for the Arts, Caton Merchant Family Gallery, 9419 Battle St., Manassas. Free. 703-330-2787 or www.center-for-the-arts.org.
Spanish chat, bring lunch and practice speaking Spanish. Noon-2 p.m., Central Community Library, 8601 Mathis Ave., Manassas. Free. 703-361-8211.
Quantico Classic Fishing Tournament, the inaugural event is open to anglers and bow fishermen of all ages and skill levels. The fishing areas are along the Potomac River, Quantico Creek and Chopawamsic Creek. 2 p.m. Friday to 4 p.m. Saturday, Quantico Town Hall, 415 Broadway St. $25; children 17 and younger, $10. 571-334-3432 or www.townofquantico.org.
First Friday Gallery Walk, Manassas Museum, local shops and galleries stay open late with refreshments and activities. 5-9 p.m., Old Town Manassas, Center Street, Manassas. Free. 703-361-6599.
“Walking with Dinosaurs,” the first film in the “Movie Under the Stars” series. 7 p.m., Northern Virginia Community College, 6901 Sudley Rd., Manassas. $3. 703-530-3072.
“South Pacific,” Castaways Repertory Theatre presents Rodgers and Hammerstein’s musical. 8 p.m. Fridays-Saturdays, through May 18, Dr. A.J. Ferlazzo Building, 15941 Donald Curtis Dr., Woodbridge. $16; seniors, students, military and county employees, $12; children 12 and younger, $8. 703-232-1710 or www.castawaystheatre.org.
Saturday in the Garden, Virginia Cooperative Extension Master Gardener volunteers lead classes on pollinator-friendly gardening. 9 a.m.-noon, St. Benedict Monastery, 9535 Linton Hall Rd., Bristow. Free, registration required. 703-792-7747.
Arts Alive, the fourth annual festival includes performances by Gainesville Ballet, Asaph Dance Ensemble, the New Dominion Choraliers, exhibits and displays by Center for the Arts, Manassas Warrenton Camera Club and Cabin Branch Quilters, workshops and children’s activities. 10 a.m.-8:30 p.m., Hylton Performing Arts Center, 10960 George Mason Cir., Manassas. Free. 703-993-7759.
Architectural Walking Tour, the guided tour will focus on the features of Old Town homes. 2 p.m., Manassas Museum, 9101 Prince William St., Manassas. $5. 703-257-8285.