At the general election on the first Tuesday following the first Monday in November 1962, and every twenty years thereafter, the secretary of state shall, and at any general or special election the general assembly by law may, submit to the electors of the state the question "Shall there be a convention to revise and amend the constitution?" The question shall be submitted on a separate ballot without party designation, and if a majority votes cast thereon is for the affirmative, the governor shall call an election of delegates to the convention on a day not less than three nor more the six months after the election on the question.