September Solano Stroll September. Free. Held on Solano Avenue, this mile-long block party is the oldest and largest free street festival in the East Bay. The entire 20-block length of Solano Avenue is blocked off to cars, and sStrollers can browse and munch their way from one end to the other. A big claim to fame is that in 1996 buffalo Bob and Howdy Doody shared the role as grand marshall.