I was not involved in any discussion on that. Quite frankly, I don't feel well qualified to answer your question. My responsibility, once a decision was made that such an event was going to be held in Toronto, was to figure out the best way to police it.
Evidence of meeting #35 for Government Operations and Estimates in the 40th Parliament, 3rd session. (The original version is on Parliament’s site, as are the minutes.) The winning word was security.
A recording is available from Parliament.