A crowd sat scattered about couches and tables lit by small candles in the dark third floor of Ampersand on a balmy Thursday night in mid-August. Joshua Davis and Marquice Williams got to work pumping up the audience. Standing under the sole hanging ceiling lamp at the front of the room, the two Savannah poets couldn’t have looked less alike — Williams lanky with long dreadlocks and Davis stocky and bald with a full beard.