The revisionist historians will tell you how peaceful Woodstock was.
The Yippies and Black Panthers extorted tens of thousands of dollars from the show producers to keep them from talking down the event and causing chaos at it. They were also provided booth space and an onsite printing press. The fences were torn down and Abbie Hoffman invaded the stage to take the mic during the Who’s set anyway.
At the event the Communists burned down the “capitalist’s” hamburger stand (you can hear it referenced in the announcements in the film).
Behind the scenes one of the radical groups (I don’t recall which one) tried to forcibly steal (by armed threat) the rented camera equipment used by the filmmakers.
And that’s just for starters.
Anybody ever go to a Rainbow Gathering over the 4th of July weekend? This was an annual event happening happening over decades as a follow-up to all with Woodstock nostalgia. Don’t know if they still have them. But having gone to several in the ‘80s, they were way better organized than what you describe even though they were a multi mile hike into the national forest that was chosen for the events.