Christina Waters in the Metroactive:
"Members of the Santa Cruz Mountains Winegrowers Association open their tasting rooms and wineries to the public. Here's why that matters: Many of these wineries aren't open to the public most of the year, and these open house days allow wine lovers to visit the wineries, meet eccentric winemakers, tour the cellars and sample and purchase rare, limited and new varietals created by our local vintners.
The Passport concept means that you purchase a miniature touring "passport" for $40 at any one of the participating wineries, and that gets you in to each and every winery on the tour. These events are out-and-out fun and tend to turn into parties, with winemakers offering finger foods and ambience-heightening live music."