ROCK N’ SCAM Concert promoter investigated by FBI, lawsuit filed and multiple investors fleeced   ORO VALLEY, Arizona —  He promoted dozens of concerts over the past five years featuring 80’s rock bands. The shows went on from Tucson to Tulsa. Now, the thrill is gone for Freddy Stahmer and his company, Frederick Entertainment. Stahmer and his company are under investigation by the FBI and being sued for fraud by five former investors. The lawsuit filed in Pima[…]