The Council shall, at its first regular meeting following each regular biennial city election, select one (1) of its members to serve as Mayor Pro Tem. The Mayor Pro Tem shall perform the duties of the Mayor when, on account of absence from the city, disability, or otherwise, the Mayor is temporarily unable to perform the duties of his office, and in case of vacancy in the office of Mayor, until such vacancy is filled by the Council. The Mayor Pro Tem shall preside over the meetings of the Council at the call of the Mayor. In the event of a vacancy occurring in the office of Mayor Pro Tem, the Council shall appoint from its membership to fill such vacancy.