Oh dear god - its the Harmony Festival:
June 12, 13 & 14 - 31st Annual HARMONY FESTIVAL
The Bay Area's 3-Day Music & Camping Festival
India Arie * Matisyahu * CAKE * Michael Franti * ALO * Sierra Leone's
Refugee All Stars * Steve Kimock * The Orb * K'NAAN * Balkan Beat Box *
Gaudi * Shpongle * The Dead Kennedys * Bad Brains * Pepper * Rebelution
Hours: TBD
Location: Venues throughout the fairgrounds
Website: www.HarmonyFestival.com (though the Orb aren't listed here)

Sigh. This is not at all what I had hoped for...