What are the challenges of building a national museum? Lonnie G. Bunch III, director of the Smithsonian National Museum of African American History and Culture, will speak on this topic during the Center for African American Studies' 18th Annual Distinguished Lecture. The event takes place at 8 p.m. April 4 in Beckham Hall. A reception will follow. Bunch, a historian, author, curator and educator, is the founding director of the national museum. In this position he is working to set the museum’s mission, coordinate its fundraising and membership campaigns, develop its collections, establish cultural partnerships and oversee the design and…