When Bob Dylan famously took the stage at the 1965 Newport Folk Festival and "plugged in" - an event dramatized at the climax of the Golden Globe-nominated film A Complete Unknown - the friendly face serving as emcee tried mightily to calm the fiercely divided crowd. Though his screen time in director James Mangold's film is minimal, Nick Pupo makes an impression as that beleaguered host: one Peter Yarrow, of Peter, Paul, and Mary. The folk trio was part of the same managerial stable as Dylan