A Mayor or Council member shall forfeit office, creating a vacancy, if he or she ceases to have the qualifications prescribed for such office by law, charter, or ordinance, or if he or she is convicted of a crime involving moral turpitude, or a felony, or an offense involving a violation of the oath of office. A Council member also shall forfeit office if he or she fails to attend three consecutive regular meetings of the Council without being excused by the Council.