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As the multibillion-dollar outdoor concert business has evolved into more elaborate productions, experts point to the Indiana State Fair's fatal stage collapse and several similar accidents as evidence of the necessity for caution and regulation.

Elaborate outdoor concerts amp up safety concerns
When thunderstorms slammed New York's Central Park before this summer's highly anticipated Black Eyed Peas concert, officials made the rare decision to call off the event. Tens of thousands of fans were livid, but safety experts praise the decision for bucking the industry's aversion to such last-minute cancellations.