Paul Simon and Bob Weir first met in 1967 when Simon stopped by the Dead's Haight Ashbury house in San Francisco to invite the group to play at the Monterey Pop Festival, but the two had never performed together until last night when Weir joined Paul during his set at the Outside Lands Music & Arts Festival in Golden Gate Park. Given that Paul had already announced his retirement for live performing, it's a pairing unlikely to ever happen again.