User blog comment:B214/Question and Answers 6/@comment-69.121.172.240-20161021050846/@comment-10330822-20161021112646

They never really touch on who exactly organizes the show, but given how the novels are talking about it. It sounds like Sirzechs and Azazel are the producers. Grayfia is looking over Issei's earnings, and Ravel is his manager.