Broadway star Danny Quadrino, 17, who has studied at Leggz Ltd. Dance since he was 6, had a number of hometown visitors recently after he opened in "Bye, Bye Birdie," his first Broadway show. Quadrino plays Mitch Miller in every performance and is also the understudy for Hugo. Quadrino and his visitors from Leggz, among them Artistic Director Joan MacNaughton and premier dancer Sam Carrell, had a pre-theater dinner and a post-theater gathering backstage in the new Henry Miller Theater.