Northwest Territorial Ordinance 1-1886 voided the results of the January 1886 Calgary municipal election and stated no Council existed in Calgary which would have been the period between January 18, 1886 and October 21, 1886.[2] /wiki/January_1886_Calgary_municipal_election
Harry Hays resigned effective June 30, 1963, Grant MacEwan appointed as Mayor by Council and sworn in July 3, 1963.
Ralph Klein resigned March 21, 1989, Donald Hartman appointed as mayor by Council on same day.