The rush for seats in the grandstand facing the dammed San Lorenzo River began early in the evening. As twilight faded into utter darkness, the crowd watched the Carnival Queen’s barge float toward her throne. Then the lights — more than a thousand incandescent globes augmented by brilliant arc lamps — were turned on, transforming the aquatic amphitheater into what one dazzled reporter described as “an arena of liquid gold with a canopy of glittering light.”