Muggles, take note: a documentary about Harry Potter fans playing real-life quidditch is about to get its world premiere at a top US film festival. "Mudbloods" follows a California university team's journey to the Quidditch World Cup, bringing the fictional schoolboy wizard's favorite contact team sport to life -- complete with straw brooms between their legs. Directed by Farzad Sangari, it's among four feature-length documentaries getting their world premiere at the five-day AFI Docs festival in Washington that starts June 18, organizers announced Wednesday. Others include the festival opener, "Holbrook/Twain: An American Odyssey" by Scott Teems, a salute to actor Hal Holbrook's long-running one-man show celebrating iconic American humorist Mark Twain. "How I Got Over," which tells the stories of formerly homeless women in the US capital, and "Back on Board," about the openly gay and HIV-positive US Olympic swimming champion Greg Louganis, round out the list. Overall, the 12th edition of AFI Docs, hosted by the American Film Institute, will bring together 84 feature-length and short documentaries from 28 countries, selected from nearly 2,000 submissions. Global politics inform many of the films, such as "Point and Shoot," about a young American joining the Libyan revolution in 2011, and "E-Team," about human rights investigators on the front lines of conflict. Lighter fare includes "112 Weddings," in which director Doug Block goes back to see how the many couples whose nuptials he recorded as a videographer are surviving marriage.