Mich. Comp. Laws § 730.419

Sec. 19. This act shall not go into effect in any city to which it applies unless the judge or judges, or justice or justices, notify the city clerk and city assessor or assessing officer in writing to prepare and file lists of names as is provided for herein. The first list shall be filed as soon as it is prepared and may be used to draw juries at the expiration of 2 months from the date of filing and until the first regular annual list provided for herein goes into effect.