“Alexander Pereira, the director of the Salzburg Festival, was to begin his six-year tenure at La Scala, the opera house here, in October, but Mr. Pisapia, the chairman of La Scala’s foundation, said that the board would honor his contract only until the end of the 2014-15 season, which coincides with Expo Milano 2015, the world’s fair expected to draw an estimated 20 million visitors.”