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“As a tour manager, it’s super important to understand what the weather conditions are when you play outside. We’ve always talked about not putting the band on during wind, lightning or heavy rain,” said Gellman, who was in Las Vegas with another client that night.

Fair officials said the stage that collapsed is erected at the start of the fair each year to provide a framework on which performers can add their own lights or other features. The roof can be raised or lowered based on the act.

Saturday’s accident was at least the fourth stage accident since the start of July. Earlier this month, wind blew over a lighting rig at a music festival in Tulsa, Okla., and lightning toppled a stage under assembly near Quebec City. That followed a summer gale that toppled a stage in July at a music festival in Ottawa, Canada, where the band Cheap Trick was performing. Three people were hospitalized.

In 2009, another Canadian storm knocked over a stage in Camrose, Alberta, killing one person and injuring about 75. And that same summer, a stage failed at Quebec City comedy festival.

The owner of the company that installed the rigging in Indianapolis expressed sympathy for the families of those killed or injured. A telephone message seeking comment from a spokesman for Mid-America Sound Corp. was left Monday by The Associated Press.

Industry standards do not spell out exactly how concert organizers should react when unexpectedly severe weather hits an outdoor event using a temporary stage, but they do specify that a safety plan should be in place.

“You have to figure out what are you going to do if some extreme weather event comes up and exceeds what you’re designed for? What’s your operational plan? How do you get people out of the way? How do you lower the roof?” said Karl Ruling, the technical standards manager for PLASA, a professional trade association for businesses that install equipment for entertainment venues.

“Obviously this is not how they planned it,” he said. “But how it ended up being wrong, I don’t know.”

Bill Gorlin, vice president of McLaren Engineering Group’s Entertainment Division, has spent roughly 15 years engineering high-end shows from Super Bowl performances to Lady Gaga concerts.

Gorlin said he is trying to get states and localities to adopt standards that would set building codes for how much temporary structures _ like the stage that collapsed Saturday _ can handle. Factors such as wind-load _ a measure of how much a stage can handle before it is blown over _ should be accounted for by state and local officials, he said.

Gorlin also worked on a panel established by the American Society of Engineers to look at what standards should be used for temporary structures like stages.

Most of the building standards used by the entertainment industry require the development of weather-management plans and set guidelines for whether parts of a stage can be dissembled or broken down.

Ruling said he would prefer the industry adopt the PLASA standards and police itself, but said it would be acceptable if states adopted PLASA standards. He said he’s against states writing their own codes, saying lawmakers can’t do as good a job as those in the business.

The search for answers in Saturday’s accident was almost certain to last for months.

The Indiana Occupational Safety and Health Administration took nearly five months to investigate the death of Declan Sullivan, a University of Notre Dame student who was killed when the hydraulic lift he was using to film football practice was toppled by a 53 mph wind gust.

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