Today is International Cabernet Day, an event that could not go unnoticed at Concannon Vineyards in the Livermore Valley. The winery hangs its proverbial hat on the varietal that has been crowned king of all grapes, an entire month’s worth of activities are planned in commemoration. After all, Cabernet Sauvignon is the variety that the winery helped propagate when the industry desperately needed disease-resistant stock for replanting in the 1960s.