As its title indicates, Virgin Mobile’s annual FreeFest is North America’s best-bang-for-your-buck music festival. Set for September 10th at Merriweather Post Pavilion, Columbia, MD, the festival’s latest incarnation offers The Black Keys, Deadmau5, Cee-Lo Green, and TV on the Radio — and all for nothing more than a “like” on Facebook.

Other notable acts include Patti Smith, Empire of the Sun, Cut Copy, Grace Potter and the Nocturnals, Okkervil River, Big Sean, and Two Door Cinema Club.

Plus, James Murphy, Calvin Harris, Ghostland Observatory, !!!, and the Teddybears will hold down the festival’s Dance Forest.

Interested attendees must first “like” Virgin Mobile Live on Facebook before they are eligible to secure free tickets, which will be available on Friday, July 15th at 10:00 AM EDT. Virgin Mobile customers and Virgin Mobile Festival ticket holders from the past five years will be invited via text and email to a private “free-sale” (much like a pre-sale, except free) to be held on Thursday, July 14th at 10:00 AM EDT.

Also available will be a limited number of FreeFest Premium Ticket Packages (aka VIP passes), which include early admission to festival grounds and souvenir items. You can buy these tickets at the Merriweather or Ticketfly websites.