Mich. Comp. Laws § 453.291

Sec. 1. That it shall be lawful for any town, county or district agricultural corporation, association or society organized under the laws of this state, whose term of corporate existence has expired or is about to expire, by limitation, to reorganize for a further period, not exceeding 30 years, at any regular or special meeting of its stockholders, if a stock company, or in case of no capital stock of its board of directors, trustees or managers, by a resolution adopted for that purpose, by a vote of 4/5 of its capital stock, or in case of no capital stock by a vote of 3/4 of its trustees, members, directors or managers, in favor of such resolution.