“An Allegory of Algorithms and Aesthetics” Jessica Drenk’s sculptures incorporate items such as toilet paper, pencils, carved books, coffee filters and cotton swabs. Through May 12. Adah Rose Gallery, 3766 Howard Ave., Kensington. 301-922-0162. www.adahrosegallery.com. Free.
Vintage poster show and sale One of the region’s largest vintage poster art shows opens Thursday with more than 500 colorful, visually striking images first made popular in the late 1890s. Through May 10. Merritt Gallery, 5445 Wisconsin Ave., Chevy Chase. 410-484-8900. www.merrittgallery-renaissancefinearts.com. Free.
“Two Trains Running” In August Wilson’s play, a diner owner struggles with racism in a Pittsburgh neighborhood. Thursday at 7:30 p.m., Friday at 8 p.m., Saturday at 3 and 8 p.m., Sunday at 3 p.m. Closes Sunday. Round House Theatre, 4545 East West Hwy., Bethesda. 240-644-1100. www.roundhousetheatre.org. $35-$50, seniors and age 30 and younger $25-$40.
61st Azalea Garden Festival Highlights of the weekend-long event include specialty boutiques, plant sales, live music, a children’s area, food vendors and more. Visit the Web site for an event schedule. Through Sunday. The Landon School, 6101 Wilson Lane, Bethesda. 301-320-3200. www.landon.net/azalea. Free.
St. George Greek festival The spring festival features traditional Greek food, live music, dance performances by the Parathosi Dance Troupe, children’s activities, vendors and church tours. Friday-Saturday noon-10 p.m., Sunday noon-8 p.m. Greek Orthodox Church of Saint George, 7701 Bradley Blvd., Bethesda. 202-494-1662. festival.stgeorge.org. Free.
Long Branch Unity Festival This family event celebrates the cultural diversity in the Long Branch community with children’s activities, arts and crafts, international foods and a moon bounce. At 11 a.m., local middle school students compete in an indoor soccer tournament, and at 2:30 p.m.,“local celebrities” and elected officials play a basketball game. 9 a.m.-4 p.m. Long Branch Community Center, 8700 Piney Branch Rd., Silver Spring. 240-777-6975. www.montgomerycountymd.gov. Free.
Art Hop Arts Fest More than 60 visual artists working in a variety of media display their works in shops, restaurants and galleries of Old Takoma. Performances include a fire-dancing show by Dance Afire on Saturday at 7:30 p.m. Old Takoma, 7035 Carroll Ave., Takoma Park. Free. 301-891-6789 or www.arthoptakoma.com.
Kentlands Day An acoustic jam kicks off the sixth annual festival at 9 a.m. followed by a parade starting at 301 Main St. at 10 a.m., Taste of Kentlands, children’s activities, performances on several stages, a car show, silent auction and more. A new feature this year is the Good Vibes Musical Festival, featuring five high school rock bands, starting at 11 a.m. in Market Square. 10 a.m.-3 p.m. Downtown Kentlands, 301 Main St., Gaithersburg. 301-258-6350. www.kentlandsday.com. Free.
“Vibration, Mystery and the Landscape” An exhibition featuring paintings by Loriann Signori. Closes Saturday. Waverly Street Gallery, 4600 East-West Hwy., Bethesda. 301-951-9441. www.waverlystreetgallery.com. Free.
“Summer Colors” A lush tropical scene will take over both conservatories while the “Wings of Fancy” butterfly exhibit takes a break. Through Sept. 21. Brookside Gardens Conservatory, 1500 Glenallan Ave., Wheaton. 301-962-1400. www.brooksidegardens.org. Free.
Walk ’n Roll A one-mile afternoon stroll, live music, raffles, games and face painting with proceeds benefitting Montgomery County Coalition for the Homeless. 1 p.m. Mattie J.T. Stepanek Park, 1800 Piccard Dr., Rockville. 301-917-6654. mcchwalknroll.eventbrite.com. $30, sage 25 and younger $20.
Taste the World in Fenton Village Sample international and American appetizers and tasting plates at more than two dozen restaurants for $2, $3, $4 or $5 per plate. Visit the Web site for maps and participating restaurants. 1-6 p.m. Fenton Village, Wayne, Georgia and Burlington avenues and Fenton Street, Silver Spring. 240-777-5301. tastetheworld.fentonvillage.org. Free.
“Masterworks 2014: A Shared Vision” The ceramics show presented by Glen Echo Pottery features the work of Jeff Kirk, the Pottery School’s artistic director, and other instructors and advanced students. Reception Sunday 3-5 p.m. Exhibit continues Saturday-Sunday noon-6 p.m., through June 1. Glen Echo Park, Popcorn Gallery, 7300 MacArthur Blvd., Glen Echo. 301-634-2222. www.glenechopottery.com. Free.
Kenwood area cherry blossom walk The self-guided seasonal walk can be taken any day through May 13. The 10K trail and the 5K option go along the Capital Crescent Trail, through the Kenwood neighborhood and on city streets. The 10K trail has hills and is suitable for strollers but not wheelchairs. The 5K option is suitable for strollers and wheelchairs and requires driving 3.2 miles to a different starting point. Driving directions are on the walk instructions. Pick up maps at Starbucks Bethesda, Shops at Sumner Place, 4611-E Sangamore Rd., Bethesda. 301-946-5496. www.sugarloafers.org. Free.
“Digital Impressions” Montgomery County artists display their digitally manipulated photographs. Through May 23. Silver Spring Civic Building at Veterans Plaza, Betty Mae Kramer Gallery, 1 Veterans Pl., Silver Spring.
240-777-5350. www.creativemoco.com/digitalimpressions. Free.
“A Shared Universe: The Art of Comic Books” This exhibition explores the history of the art form, as well as new concepts. Through June 7. Mansion at Strathmore, 10701 Rockville Pike, North Bethesda. 301-581-5100. www.strathmore.org. Free.
“Radical Elements” Works on view in the Studio Art Quilt Associates’ first exhibit are each based on elements in the periodic table. Through May 9. Montgomery College, Morris and Gwendolyn Cafritz Foundation Arts Center, 930 King St., Silver Spring. 240-567-5821. www.montgomerycollege.edu/schoolofartanddesign. Free.
Susan Makara and Leslie Nolan: “Vivid” The exhibition features Makara’s mysterious scenes and Nolan’s large-canvas evocative portraits of solitary figures. Opens Wednesday. Through June 7. Opening reception May 10 at 5:30 p.m. BlackRock Center for the Arts, Main Gallery, 12901 Town Commons Dr., Germantown. 301-528-2260. www.blackrockcenter.org. Free.
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3The exhibition features Makara’s mysterious images and Nolan’s large-canvas evocative portraits of solitary figures. Opens Wednesday. Through June 7. Opening reception May 10 at 5:30 p.m. BlackRock Center for the Arts, Main Gallery, 12901 Town Commons Dr., Germantown. 301-528-2260. www.blackrockcenter.org. Free.