Bay seniors unable to control their limbs whenever Brazilian music starts might want to consider ambling over to Yerba Buena Gardens this Saturday August 20 from 1-3. A concert with heavy emphasis on drumming will include works from some of Brazil’s most hypnotic composers. Free, of course, like all the events at Yerba Buena Garden’s annual festival. You’ll find a constant flood of cheap ways to entertain yourself at fun&cheapsf. .