What should have been a low-key documentary premiere turned into a near-riot, sparked by a DJ’s ill-conceived tweet.

Five hundred or so invited moviegoers were expected at Grauman’s Chinese Theatre for Wednesday’s red-carpet screening of the Electric Daisy Carnival Experience, a doc about one of the nation’s largest annual techno-dance fests. (It’s a subject with which the city of Los Angeles already has a very controversial history.)

Instead, thousands of uninvited guests descended upon Hollywood Boulevard in response to a Twitter message sent by L.A. club DJ Kaskade, urging his 92,000 followers to gather outside the theater at 6 p.m. for a free concert celebrating a new movie about the rave scene.

“ME+BIG SPEAKERS+MUSIC=BLOCK PARTY!!!” Kaskade tweeted. ”Let’s see if the magic of social networking will work today.”

Seems it was working just fine.

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