Mich. Comp. Laws § 81.11

Sec. 11. The first election in and for the new corporation shall be held on the first Monday in April next after the filing of the declaration of incorporation in the office of the secretary of state: Provided, There shall be sufficient time after the division of the city into wards, to make a registration of the electors, and to give the notice of election hereinafter required; and if there shall not be sufficient time for that purpose, then such first election shall be held on the first Monday of April next thereafter; or the council may appoint a day for the holding of a special election, upon giving like notice as hereinafter required for the holding of such elections.