SAN JOSE, Calif. — The inaugural Mill Valley Music Festival launches this May. Ben Harper and the Innocent Criminals are set to headline the multi-musical genre event, which is presented by the Mill Valley Chamber of Commerce. Other acts on the bill include Lettuce, Liz Cooper; Los Amigos Invisibles and La Doña. The event will take place at Friends Field, which is located next to the Mill Valley Community Center near downtown Mill Valley. Organizers plan to turn the field into “a sprawling festival grove for a one-day, all-ages celebration of local arts and culture,” according to a news releas…