Chillicothe, ILs Summer Camp has added some additional acts to its line-up. The New Pornographers, Girl Talk, Mifune, The PMG, Sub-ID and Waterstreet all will appear at Three Sisters Park from May 23-25. These groups join a stacked roster of performers that already includes: moe., Umphreys McGee, the Flaming Lips, George Clinton and Parliament-Funkadelic, O.A.R., The Roots, STS9, Tea Leaf Green, Lotus, U-Melt, Future Rock and Macpodz. As in years past, the Summer Camp gates will open a day early for a separately ticketed pre-party.