235th Flag Day of the United States, National Park Service rangers in 1776 and Civil War attire discuss the history of the flag. 11 a.m.-4 p.m., Washington Monument, 15th Street and Constitution Avenue NW. Free. Call Mike Rose, 202-438-9667.
“Quantifying Water Use on Farms and Ranchlands,” discussed by Martha Anderson of NASA. 11:30 a.m., Library of Congress, Madison Building, Mary Pickford Theater, 101 Independence Ave. SE. Free. 202-707-7450.
Portrait Gallery tour, Ann Shumard, curator of photographs, discusses three portraits on display and what links the three subjects. Noon, National Portrait Gallery, Eighth and F streets NW. Free. 202-633-1000.
Lloyd Dobler Effect concert, rock music; take a blanket. 5:30-7:30 p.m., Farragut Square Park, 17th and K streets NW. Free. 202-463-3400.
“Tudor Nights: A Midsummer’s Enchantment,” for age 21 and older, stroll the gardens; view the mansion and Andrew Lang’s “Fairy Series,” featuring full-color plates and woodcuts by children’s illustrators; sip a vodka-thyme lemonade and taste summer-theme treats. 6-8 p.m., Tudor Place, 1644 31st St. NW. $15. 202-965-0400.
Food writing class, Peat O’Neil teaches how to refine or finish a culinary memoir or feature article; plus discussion of self-editing, recipe construction, interviewing techniques and publication options; bring a draft of a food memoir, essay or article with related recipes to work on during class. 6-9 p.m., Hill Center at the Old Naval Hospital, 921 Pennsylvania Ave. SE. Free. 202-549-4172 or www.hillcenterdc.org.
Vietnam Veterans Memorial, a National Park Service ranger discusses the sacrifices of Vietnam War veterans and the symbolism of the memorial. 6-6:45 p.m. and 8-8:45 p.m., Vietnam Veterans Memorial, Constitution Avenue and Henry Bacon Drive NW. Free. Call Victor Pillow, 202-841-1774.
“The Worlds of Benjamin Franklin,” Richard Bell, a University of Maryland history professor, discusses Franklin’s contradictions. 7-9 p.m., S. Dillon Ripley Center, 1100 Jefferson Dr. SW. $40. 202-633-3030.
“The Animals and Children Take to the Streets,” 1927, a British company, performs a work about a dystopia, featuring animation and live actors and music. 7:30 p.m. Thurdays-Fridays, 2:30 and 7:30 p.m. Saturdays-Sundays, through July 1, Studio Theatre, Metheny Theatre, 1501 14th St. NW. $35-$69. 202-332-3300 or www.studiotheatre.org.
U.S. Army Concert Band concert, works by John Philip Sousa and a musical tribute to Glenn Miller. 8 p.m. Thursday-Friday, U.S. Capitol (west steps), Pennsylvania Ave. NW and First Street NW. Free. 703-696-3399.