I've been working on a book on Mississauga, and I have collected material during my research at the Mississauga Central Library's Canadiana Room and Local History Department where I found inexhaustible, and fascinating documents.
In the meantime, here is a photograph of the inauguration of the AGM at the official opening of the Mississauga City Hall in 1987, with the then mayor Hazel McCallion showing the Duke and Duchess of York the inaugural events.