The talking points from the gigantic Chicago rock festival

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Reuters

This past weekend marked the 20th anniversary of the event that has evolved over time from alt-rock coming-out party to touring nu-metal circus to, now, the most-prominent, catch-all American music festival—an event that's either the best concert collection of the year, or "Walmart on the Lake."

So what happened at Lollapalooza in Chicago's Grant Park this time around? Eminem, Coldplay, and the Foo Fighters served as headliners, bolstered by dozens and dozens of acts on the undercard. We've read through the coverage to find what seem to be the most interesting bits—the had-to-be-there moments, controversies, and headline-making revelations.