Some light hearts lift a heavy subject by Robert Dominguez
Finding humor in Sept. 11 would seem inappropriate just a year later, especially with the memorials going on this week.<br /> But at the second installment of "Brave New World: American Theatre Responds to 9/11," the three-day benefit commemorating the anniversary of the attacks, the laughter that accompanied the handful of witty plays interspersed among the serious pieces, somber songs and melancholy poems seemed to…