On Friday evening, March 16th two dozen autistic youngsters and their families quietly filed into the deserted floor of the Verizon Center as the guests of Ringling Bros Barnum & Bailey Circus. Sitting in one of the circus’ three rings, they were treated to a sensory-friendly up-close-and-personal experience with a miniature horse, jugglers, clowns, tightrope artists, and be-spangled dancing girls.