I was seeing this all over facebook the other day. It was exasperated exclamations about there being a ridiculous amount of traffic in Hollywood due to some sort of riot. CBS News has the explanation. A DJ featured in a documentary about the Electric Daisy Carnival was at the premier at Mann's Chinese Theater. He tweeted, "Today(at)6pm in Hollywood (at)Mann's Chinese Theatre. ME+BIG SPEAKERS+MUSIC(equals)BLOCK PARTY!!! RT!" and then chaos ensued. So now you know.