THE BOARDS
HELLO MUDDAH, HELLO FADDAH by Lillian Ross</b><br /> Box-office is down on Broadway, but the most cheerful and high-spirited theatrical producer in town last week was Camp Broadway, yielding three musicals—"Oklahoma!," "State Fair," and "On the Town"—plus a number of perks. The performers, rehearsing at Chelsea Studios during five overpacked days, were a hundred and forty-eight kids between the ages of ten and se…