A group of African-American filmmakers, musicians and other stars held a benefit for Flint residents Sunday, the night of the Oscars. “Creed” director and co-writer Ryan Coogler, who was passed over for a nomination while white actor Sylvester Stallone was nominated for his role in the film, joined “Selma” director Ava DuVernay and many more at the #JusticeForFlint event, as did musicians Janelle Monáe and Stevie Wonder.