The July 23-24 event will take place in Chicago’s Grant Park and will ultimately include more than 60 bands on five stages. The current lineup also includes Widespread Panic, Billy Idol, The Black Keys, The Walkmen, Death Cab For Cutie, The Bravery, Blonde Redhead, Cake, M83, The Dandy Warhols, Tegan and Sara, Kasabian, Ambulance LTD, Blue Merle, Brian Jonestown Massacre, The Warlocks, Z-Trip, The Changes, DeSol, G. Love & Special Sauce, Kaiser Chiefs, Los Amigos Invisibles, Louis XIV, The Redwalls, and World Leader Pretend.

The recently reunited Digable Planets will appear, as will Dinosaur Jr, which just days ago announced a full reunion of its original members.

This year’s one-off edition marks a departure from the traditional Lollapalooza tour model. Last year, a two-day traveling festival was planned but scrapped after poor ticket sales.

The first batch of tickets is on sale now at $85 (plus service charges and shipping) for a two-day pass. According to the festival’s official Web site, prices will increase without notice to $100 and then $115. Single-day passes are not available.

Earlier this month, organizers sold 2,000 two-day passes via the official Lollapalooza mailing list. The passes – priced at a discounted $35 – sold in 80 minutes, even though no artists had been announced.

Organizers hope to win city approval for at least 30,000 fans per day, according to the Chicago Sun-Times.

The event is being produced by Capital Sports & Entertainment and Charles Attal Presents, and presented by Chicago’s Parkways Foundation. Festival founder Perry Farrell is a partner and creative consultant and William Morris Agency is also chipping in.