This week: Too Short’s ‘Blow the Whistle’ at 20, local Black figures through history, cheap eats in the Sunset, the library’s small business resources, and Sports Basement comedy club; plus: walking the Bay Bridge, descending the Hawk Hill stairs, and exploring Black history through music.Behind the racksSan Francisco’s Comedy “Run” Club has turned a tucked-away corner of Sports Basement Presidio into a monthly hotspot for laughs. Every second S…