When a new township is formed, in which township officers are to be elected, the board of supervisors shall call the first township election, to be held at such place as it may designate, on the day of the next general election. If at any time a new township has been created in a year in which no general election is held, the board may call a special election for the election of the township officers of the new township, who shall continue in office until their successors are elected and qualified.