Original: The Overture debuted in the Cathedral of Christ the Saviour in Moscow on August 20 , 1882 ( in the Gregorian or NS calendar ; the date in the Julian or OS calendar was 8 August ) .
Simplified: The Overture was first presented to the public in the Cathedral of Christ the Saviour in Moscow on August 20 , 1882 ( NS ; the OS date was 8 August ) .