Celebrate Hill Center at the Old Naval Hospital’s seventh birthday on Sept. 30, 2 to 6 p.m., with Civil War-era activities and figures, including Abraham Lincoln, a team of coppersmiths and blacksmiths, horse-drawn wagon rides, interactive games and crafts, as well as face-painting and balloon animals. Turley the Magician performs at 2:30 p.m. At 4 p.m., King Bullfrog will hit the stage with high-energy original, folk and blues songs carefully tailored to get children dancing and delight grownups. The Gina Clowes Project will perform around 5:15 p.m. Using the banjo as a medium of personal expression, Clowes moves through varied modes of musical treatments. Hill Center, 921 Penn. Ave. SE. hillcenterdc.org.