Mich. Comp. Laws § 120.3
If such petition be found to be insufficient, it shall be returned to the person or persons filing the same, who may, within 10 days thereafter, amend or add names thereto, when the same shall be returned to the county clerk who shall have an additional 15 days to examine the same and attach his certificate thereto. No person having signed such petition shall be allowed to withdraw his name therefrom after the filing of the same with the county clerk. Whenever such petition shall be certified to as sufficient, the county clerk shall forthwith transmit the same, together with his certificate of sufficiency attached thereto, to the board of county supervisors, who shall submit such proposition at the next general election, or the board of county supervisors may at their first meeting after the date of such certificate, by resolution call a special election to be held not less than 30 days nor more than 60 days from the date of such certificate.
MCL 120.3