E. J. Thomas Hall is nearly sold out for this weekend's performances of George Gershwin's "Porgy and Bess".  The Akron Symphony Orchestra production has been a massive undertaking, involving more than 350 singers, players and stage crew. It's the first fully-staged opera in the orchestra's history. The choice of "Porgy and Bess" is a natural one for Music Director Christopher Wilkins and his musicians because of the annual success of "Gospel Meets Symphony". But the opera's performance history is not without controversy.