Okay, KVMR Celtic Festival Producer John Taber maybe hasn’t seen it all in music, but he’s certainly been there a lot. “Based on the events I’ve been involved in, the most mystical and magical experience in the air is to walk through the Celtic Festival green any given Saturday night,” he beams with an ear-to-ear grin. Oh, and it just so happens the 19th annual KVMR Celtic Festival and Marketplace takes place this weekend at the Nevada County Fairgrounds. From 1983-89, he pretty much worked exclusively for the Grateful Dead at their concerts on backstage security. “My job was to be a sort of buffer between the people who ‘knew’ the Grateful Dead and the people the Grateful Dead actually knew,” he explains.