The White House billed it as the first dance event. Yet, the gilded East Room has hosted its share of dance over the years, including performances by American Ballet Theatre and Jerome Robbins’ Ballets: USA during the Kennedy Administration; Patricia McBride and a chandelier-grazing Mikhail Baryshnikov during the Carter Administration; and a strut-worthy cast of alumni from “A Chorus Line” glammed it up during Reagan’s Administration. [...]