“You’re damn right I got the blues,” Buddy Guy sang out as he opened his headlining set at the annual Russian River Jazz and Blues Festival in fiery northern California on Sept. 13. While the so-called 73,000-acre Valley Fire, which burned more than 500 homes, raged as close as 30 miles away, the two-day festival site at Johnson’s Beach on the Russian River in the small, Bohemian town of Guerneville, California, was smoke-free.