by Daniel Hathaway, ClevelandClassical CLEVELAND, OHIO — This season, the Mandel Festival of Opera and Humanities is featuring three concert performances of Ludwig van Beethoven’s only opera to illustrate the Festival’s theme of Courage. The opening concert at Severance Music Center on Saturday evening, May 16 also demonstrated the mastery of conductor Franz Welser-Möst and The Cleveland Orchestra and Chorus, whose Beethoven performances are second nature and flawless.