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.
Definition of hall for Students. 1  1 : a passage in a building that leads to rooms : corridor. 2  2 : an entrance room. 3  3 : auditorium.  4 : a large building used for public purposes city 1  hall. 5 : a building or large room set apart for a special purpose a dining hall.