Foo Fighters celebrate July 4 with lots of opening acts and a mobile throne

Foo Fighters founder-frontman Dave Grohl cultivates a reputation as a minivan-driving regular guy from Springfield, Va. But his band's 20th anniversary celebration Saturday at RFK Stadium was a grand affair. Eight acts preceded the quintet's arrival on stage, and the concert concluded with nothing less than a challenge to the National Park Service: the Foo Fighters's very own 4th of July fireworks display. Also, Grohl spent most of the otherwise routine show on what he described as a "throne."