From Monday's SF Chronicle gossip column:
And at Tuesday's U2 concert, Bono described a Bay Area dinner the night before as a G-3 summit of U2, Metallica and Green Day, talking about staging a music festival. The venue, The Chronicle's Paolo Lucchesi blogged Thursday, was A16, and there were more than three summiteers. The gathering included Lou Reed, U2 drummer Larry Mullen Jr., the Edge, Green Day's Billie Joe Armstrong and Metallica's Lars Ulrich. After dinner, the movable feast continued at Rye.
Rumor has it that Reed was in Marin last week, recording with Metallica.