(a) Vacancies: A member of the Common Council shall vacate his office upon his death, resignation or removal from office in any manner authorized by State law or forfeiture of his office.
(b) Forfeiture of Office: A member of the Common Council shall forfeit his office if He: (1) lacks any qualification at any time during his term of office for the office prescribed by this Charter or by State law, (2) violates any express prohibition of this charter, (3) is convicted of a felony, (4) fails to attend three consecutive regular meetings of the Common Council without being excused by the Council, or (5) loses residence in the ward from which he was elected.
(c) Filling of Vacancies: In case of a vacancy for any cause in the position of member of the Common Council, the Mayor with the approval of the Common Council shall appoint a qualified person to fill the vacancy until the next regular election of the City of Springfield, at which time, the vacancy shall be filled by election for the unexpired term, if any. In the case of a vacancy for any cause in the position of Mayor, the Common Council shall, by majority vote of its full number, appoint a member of the Common Council to fulfill the unexpired term. Despite the quorum provisions hereof, if at any time the membership of the Common Council is reduced to less than four, the remaining members may, by majority action, appoint additional members to raise the Common Council membership to six aldermen and one mayor.