The Dave Matthews Band closed out its summer tour by performing at San Francisco’s Golden Gate Park on Sunday. The show was ostensibly free although the band actively encouraged attendees to make donations to benefit area charities. Towards the end of the group’s performance, celebrated Bay Area guitarist Carlos Santana joined for three songs: ‘Warehouse,’ ‘Sugar Will’ and ‘All Along The Watchtower.’ DMB is now off until October 1 when the Vote For Change tour begins at the Bryce Jordan Center in University Park, PA.