In case any vacancy shall occur in any of the offices in this Charter declared to be elective, the Council shall fill such vacancy by the appointment of a qualified person, and any person. appointed to fill a vacancy shall hold office, by virtue of such appointment, until his or her successor is elected at the next general City election and has duly qualified, provided that if the Council shall deem it expedient it may call a special election to fill any vacancy occurring in any elective office, according to the provisions of this Charter. The Council shall not fill any vacancy by appointment, except in the office, of the Justice of the Peace, within ninety (90) days prior to any general City election.