The Orion Ensemble, Chicago’s nationally recognized and critically acclaimed chamber music ensemble, continues its 20th Anniversary Season with “A Night at the Opera,’ featuring works by two well-known composers of opera along with a piano transcription of an opera excerpt. Performances take place November 25 at Fox Valley Presbyterian Church in Geneva, December 2 at Music Institute of Chicago’s Nichols Concert Hall in Evanston and December 5 at the PianoForte Salon at the Fine Arts Building in Chicago. Roger Chase on viola and Stephen Boe on violin join Orion for this program.