The Indianapolis Motor Speedway had to replace a temporary stage that did not pass inspection.
The Event Alliance gathered in Indiana to establish standards to be used on outdoor stages throughout the U.S.
64 of the 65 claimants who were offered settlements from the state fair disaster have accepted those offers.
The engineering company the commission has hired to conduct the on-site accident investigation, is seeking photos and video of the stage.
State Fair Spokesman Andy Klotz said policies and procedures are also under scrutiny.
22-year-old Jennifer Haskell of Fort Wayne died today after being injured in Saturday's stage collapse.