The regular general town election shall be held on the first Tuesday following the first Monday in November in each odd numbered year.
A preliminary election for the purpose of nominating candidates shall be held on the third Tuesday in September in each odd numbered year, provided, however the town clerk may, with the approval of the town council, reschedule such election to the fourth Tuesday to avoid a conflict with any civil or religious holiday. Whenever a special election to fill a vacancy in the office of mayor is to be held, a preliminary election shall be conducted twenty-eight days proceeding the date established for such special election.