Bay seniors know that every burg within shouting distance has a tree lighting ceremony this season. If you want to get out of the tannenbaum rut, journey up to the amazingly imaginative gardens and stores at Sonoma’s Cornerstone. On November 26 from 4 til 7 you’ll see their 7tth annual Lighting of the Snowmen. In typical madcap Cornerstone fashion there will be a small army of 150 snowmen aglow. Plus all kinds of entertainments for the kids. Free. A benefit for PetsLifeline.