Street events are rituals of release. Not street-theater, the street is theater. Parades, bank robberies, fires and sonic explosions focus street attention. A crowd is an audience for an event. Release of crowd spirit can accomplish social facts.
Riots are a reaction to police theater.
People fill the street to express special public feelings and hold human communion. The alternative to death is a joyous funeral in company with the living. Industrialization was a battle with 19th-century ecology to win breakfast at the cost of smog and insanity. Wars against ecology are suicidal. The U.S. standard of living is a bourgeois baby blanket for executives who scream in their sleep.