What's happening to Zinfandel?

These days, wine festivals abound across America, especially those featuring Pinot Noir, which seem to be popping up by the handful in every major wine market in the country. There was a time, however, when wine festivals dedicated to a single grape were few and far between. Ten years ago, the hottest ticket in public wine-tasting events took place once a year in San Francisco. Consumers (and the trade) would line up hours in advance for the sold-out event, held in not one, but two massive event pavilions, and by its conclusion, the event would resemble less of a public...