In July 2011, during its European tour, the chorus competed in the Summa Cum Laude International Youth Music Festival in Vienna for the first time, and placed 2nd in the treble category.
In the summer of 2017, the CCOC toured Prague, Krakow and Budapest with their production of Brundibar by Hans Krasa.
On October 26, 2017, the CCOC celebrated their 50th anniversary with a concert titled "Ruby's Gold" at the Four Seasons Centre.
The evening was hosted by tenor Ben Heppner and featured many Canadian singers including Krisztina Szabó, Simone Osborne, Measha Brueggergosman and Andrew Haji, many of whom are CCOC alumni.
[2] The CCOC has toured across Europe and Canada and continues to expand its repertoire of music in various languages including English, French,[3] Italian, Serbian, Russian, Mandarin, Hungarian, German, as well as several African languages.