From Lollapalooza.com:
Get excited because Perry Farrell and the gang — Jane’s Addiciton — ARE BACK and playing an Official Aftershow on the Saturday night of Lollapalooza 2012 at the legendary Aragon Ballroom with special guests and Lolla 2012 performers Franz Ferdinand! But that’s not it — dubstep pioneers Skream and Benga will be on hand to close out the late night party.
Tickets for this special aftershow will be available here and go on-sale this Friday, July 13 at 10AM Central Time for the ridiculously low price of $15.