"This is the story of New Orleans’ black Mardi Gras,” says filmmaker Royce Osborn at the beginning of his award-winning 2003 documentary, All on a Mardi Gras Day. Focusing on the traditions of the Mardi Gras Indians, skeletons, baby dolls and street parades, Osborn, a New Orleans native, opened up the eyes of the world and even many New Orleans residents to the colorful, primarily African-influenced way that Carnival was and is celebrated in black neighborhoods across the city. Osborn,...