WALNUT CREEK — Sweet centennial celebration will pour, literally, at Walnut Creek’s 33rd Art and Wine Festival, when Shadowbrook Winery unveils its 100th anniversary Centennial Blend.

Cultivated in soil just a few miles northwest of Mount Diablo, in a valley area considered by vintners in the late 1800s to be a “preeminent” grape growing region, the 1.5 Magnum Bordeaux-style blend is a homegrown original…