Sentence:  Bengston doing a <WSD>roomful</WSD> of painting is like Joe Willie Namath doing a gameful of curl patterns, Jason Robards doing an eveningful of O'Neill, Tina Turner doing a concertful of. . . . and so on. 
Meaning of the word marked with <WSD> tags:  The amount that a room can hold, especially the number of people that can fit into a room.