August 13 and 14, Tokyo and Osaka (well, Chiba and Osaka to be more precise). Headliners are Red Hot Chili Peppers and the Strokes.
http://www.summersonic.com/2011/
The major Japanese festivals usually release the dates simultaneously on January 1 each year, so I'm not sure why Summer Sonic are jumping the gun, announcing not only the dates but the headliners as well.

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