Vassar's first junior prom, a Junior-Sophomore Dinner Dance, was held in "Room J," the "Raymond Reading Room," the "Students' Room" and the north and south corridors of the second floor of Main Building. Informal dancing at 4 in the afternoon was followed by "regular" dancing at 5 and dinner in the Main Dining Room.  A decorative scheme, in green and yellow, was provided by yellow lights shining through grouped smilax and yew trees.  The format for a Junior Prom—although not yet the promenade or Grand March—came about in 1914 when the faculty refused to allow separate dances for the sophomore and junior classes, causing the sophomores to withdraw from the annual event.  In time, the Junior Prom became the single most important social event in the college year.     The Miscellany News