Lloyd Meadows of Zydeco Flames strums his washboard while playing in the Riverfront Refuge this afternoon during opening day of the 37th Annual Sac Jazz Festival & Jubilee. A musician rolls her contra-bass on the pavement on the way to her next gig.   The guitarist (above) of Tom Rigney and Flambeau gestures to the crowd while playing in the Firehouse Lot. Rigney plays the electric violin (below). The Fulton Street Jazz Band plays to a full house in the Firehouse Courtyard. Bob Ringwald, pianist, started his jazz band in the 1960s and played at the first Sacramento Jazz Festival known then as the Dixieland Jubilee. Bob Sako plays the fugelhorn (below). Darrell Fernandez on the bass,