Taste of Redwood Valley takes place on Father's Day weekend every year - June 17-19 this year. Five wineries in the event offer organically grown wines.
Oster (generally not open to the public)
Testa (generally open only by appt.)
(Graziano also has one organically grown wine - the Eddie's Vineyard Zin.)
There will be a winemaker dinner on Friday night anx two days of tasting, art and music. The cost is $80 for all the events (advance online ticketing) or $55 for the winemaker dinner and $35 for the two day tasting pass.
Redwood Valley is just east of Ukiah. It's about 2 hours and 15 minute drive from the Bay Area.