Montreal, 1925
The idea came from H. E. T. Haultain, a mining-engineering professor at the University of Toronto, who asked Rudyard Kipling to write the text of the calling. Haultain held the first ceremony on 25 April 1925 at the University Club in Montreal; a second followed in Toronto on 1 May 1925. The body that runs the ceremony, the Corporation of the Seven Wardens, was formally incorporated in 1938.
To verify: Each detail against the Corporation of the Seven Wardens’ own history pages and Engineers Canada’s centenary article, which we could not open; Who the first seven Wardens were: one source we saw says past presidents of the Engineering Institute of Canada, Wikipedia says the name honours the first seven presidents of the Canadian Society for Civil Engineers