The opening credits last card reads: "Any similarity to persons, places, or things depicted in this documentary is purely intentional."
Although never mentioned by name in the film, the music festival near the end was the Miami Rock Festival, Miami-Hollywood Speedway, Florida, Dec 27-29, 1969.
The trailer says, "Five-Hundred-Thousand-Plus Peace Marchers on a Brisk November Day in Washington, D.C.". Actually, the documentary shows the (now historic) 11/15/69 march on, and rally at Washington D.C. attended by over half a million persons called by the Vietnam Moratorium Committee.