Awash in the March on Washington

Stage-setters began a month ago, building to Aug. 28; NPR CEO Gary Knell leaving for National Geographic; Egyptian military lashes out at foreign news media; Ellsworth Davis, 86, first black photog at Washington Post; "The Butler" opening nearly recoups its production costs; Al Jazeera America debuts, but advertisers still skittish; PBS three-part "Latino Americans" seeks a wide audience (8/19/13)