The National Portrait Gallery (Eighth and F Sts. NW, Washington, D.C.; 202-357-2700) is exhibiting lithographs of famed French poster artist Paul Colin, including portraits of Josephine Baker, in “Le Tumulte Noir: Paul Colin’s Jazz Age Portfolio.” The exhibit, on view through September 14, will be complemented by recordings of Baker and other musicians of the day… “A House Divided: America in the Age of Lincoln” at The Chicago Historical Society (Clark Street at North Ave.) includes 600- plus artifacts, including letters from Frederick Douglass and photos of Black Civil War soldiers. Call 312-642-4600. The exhibit will remain on view through mid-2000. . . Celebrate Juneteenth in San Antonio, Texas, June 13-15. Festival activities include parades, music and family activities all around town. Call 210-650-4471 for more information …Memphis holds its annual Juneteenth Freedom Festival at Douglass Park (north Memphis) June 20-22. Enjoy three stages of music, storytelling, children’s rodeo and an old timer’s baseball game. Call 901-458-3950 for details.