(Credits: Simon van Boxtel / Sasha Vasiljev / Berliner Festspiele official website) Conductor Jaap van Zweden will return to the Royal Concertgebouw in the famed NTR Saturday series to conduct Beethoven’s only opera “Fidelio.” Van Zweden, who turns 60 on Dec. 12, will lead the Netherlands Radio Philharmonic Orchestra and the Dutch Radio Choir in the presentation of Beethoven’s operatic {…}