Michigan Compiled Laws, Chapter 207. Taxation § 207.635

(a) Establish and collect fees or other charges as are convenient or necessary to produce sufficient revenues to meet the expenses of the local governmental unit for operating the convention facilities.

(b) Fulfill the terms of any agreement made with the holders of bonds, obligations, or other evidences of indebtedness issued by the local governmental unit, or in any way impair the rights or remedies of the holders of bonds, obligations, or other evidences of indebtedness issued by the local governmental unit until the principal amount of the bonds, obligations, or other evidences of indebtedness, together with interest, and premiums, if any, on the bonds, obligations, or other evidences of indebtedness and interest on any unpaid installments of interest, and all costs and expenses in connection with an action or proceedings by or on behalf of the holders are fully met, paid, and discharged.