The first election of officers of the Graded School District may be held at a special meeting duly warned by the District Clerk of District Number 2 in Jericho or of Number 3 in Underhill by both of the District Clerks, on a petition signed by seven legal voters in the Graded School District, under the laws governing the warning of special school meetings in other districts, and the officers so elected shall hold their respective offices until their successors are elected at the next annual school meeting.