Delaware Valley Opera has announced its summer 2021 season. It all kicks off with an “Operetta Concert” featuring music by Gilbert and Sullivan, Léhar, Romberg, Herbert, and many others. The showcase will star Annie Chester, Marcus Huber, Elise Mark, Ken Parks, Brooke Schooley, Jonathan Stinson, and Nicholas Wuehrman. Matthew Rupcich will conduct the performance, which will be directed by Nicholas {…}