Washington Opera moves into tiny Constitution Hall while its home at the Kennedy Center is renovated. “Longtime concertgoers have been shaking their heads. An opera house? With that tiny stage? In that vast, cavernous diffusion of bluish space? An opera house. It was not only home to the National Symphony Orchestra for that ensemble’s first 40 years, but it has been the site of countless recitals by the great, the near-great and the long-forgotten, both before and after the Kennedy Center opened in 1971.”