The disgraced organizer of the Fyre Festival, who was charged last year with wire fraud in connection to the failed event, ran a fraudulent ticket-selling scam for several months while he was out on bail and now faces new charges, federal prosecutors said on Tuesday.

The announcement came about two months after the organizer, Billy McFarland, pleaded guilty to defrauding investors and vendors of the festival, marketed as a music extravaganza in the Bahamas. He piled up losses of about $26 million and is scheduled to be sentenced next week.

In a statement on Tuesday, federal prosecutors in Manhattan said that from late 2017 to about March — months after Mr. McFarland had been charged — he ran a company that sold fraudulent tickets to exclusive events like the Met Gala, Burning Man and Coachella. In one case, the authorities said, two customers flew from Florida to New York for the Grammy Awards, only to be turned away at the door.

Prosecutors also allege that Mr. McFarland used an email account in the name of another employee of the company he owned, NYC VIP Access, and sent sale proceeds to other people’s financial accounts to try to hide his involvement.