Deadmau5 at the 2011 Virgin Mobile FreeFest. (Photo by Francis Chung).

It took all of two minutes for I.M.P. to unload general admission tickets to the Virgin Mobile FreeFest on October 6 at Merriweather Post Pavilion, the concert promoter announced today. Tickets were made available last week, with a limited batch released Thursday and the majority distributed Friday.

Even though most of the passes are gone, there are still a couple routes for those desperate to see a lineup that includes Skrillex, ZZ Top and The Dismemberment Plan, among other acts.

As in past years, Virgin Mobile is offering a ticket to anyone who contributes their time to its associated charity, RE*Generation, which works to curb youth homelessness. Last year’s effort resulted in 75,000 volunteer hours, Virgin Mobile said in the press release.

Alternatively, there is a cash option. The “Freemium” package costs $49.50, some of which goes to RE*Generation, and includes a T-Shirt and souvenir cup along with admission.