U2 CELEBRITY SIGHTNINGS
Spotted outside the Four Seasons, which is the band's San Francisco camp: U2 singer Bono, with Robin Williams, Sean Penn and lars Ulrich, from Metallica.
The singer thanked each of these local celebs during his show for charity work, as well as members of Green Day and SIlicon Valley venture capitalist Roger McNamee, who has a joint venture with the singer called Elevation Partners.
