There is a micro-phenomenon of new wave, special snowflake directors that try to revolution the canons of classical opera. I saw Carmen being banged behind a burning car next to what looked like a flamenco-infused Thunderdome. That was in Paris opera, stronghold of modernist SJW nonsense.
Here, the expression is a shorter version of matriculation college. In a number of Canadian cities, many government-run secondary schools are called collegiates or collegiate institutes (C.I.), a complicated form of the word college which avoids the usual post-secondary connotation.
college. n. 1. (Education) an institution of higher education; part of a university. 2. (Education) a school or an institution providing specialized courses or teaching: a college of music. 3. (Education) the building or buildings in which a college is housed. 4. (Education) the staff and students of a college. 5.