Jennifer Jost keeps the wine flowing as Paul Wren enjoys the evening ambience at Hannah Nicole Vineyards’ brand-new winery in Brentwood last Saturday. The members-only event – which featured tours, live music, good food and, of course, good wine – marked a new beginning for East Contra Costa: the area’s first winery to open since Prohibition brought winemaking to a halt in 1920. Hannah Nicole’s next event: the fourth annual Grape Stomp and official Grand Opening Saturday, Sept. 12.