Don't Ask, Don't Tell
Once again, the Muny plays I've Got a Secret with casting BY DENNIS BROWN</b><br /> These venerable musicals are selling briskly, despite that fact that ticket buyers do not know -- or apparently care -- who will be appearing as Tevye (it's Bruce Adler) or Nellie Forbush (haven't a clue). Hey, if you're sitting far enough back in an 11,000-seat theater, what difference does it make?<br /> <font size="1" face="Arial,H…