Mich. Comp. Laws § 168.595
At the time of issuing the call for the county convention of any political party for the election of delegates to a state convention, the county committee of each political party shall apportion to the various wards (or to the precincts, in case delegates to the county convention are elected by precincts) and townships of such county the delegates to the ensuing state convention to which such county is entitled upon the basis provided for in this act for the apportioning of such delegates to the several counties. Any township may be joined with 1 or more other contiguous townships or any ward of a city may be joined with 1 or more other wards of the same city (or, in case delegates to the county convention are elected by precincts, then any precinct may be joined with 1 or more precincts of the same city), in the formation of a district for the choosing of 1 delegate. The delegates to the county convention from each ward, precinct, township or district, as the case may be, shall choose the number of delegates to the state convention that have been apportioned to such ward, precinct, township or district. The number of delegates so apportioned to the several wards, precincts, townships and districts shall approximate, as nearly as may be, the number of delegates to which said county may be entitled. If any ward, precinct, township or district shall be without representation in the county convention, or if such ward, precinct, township or district shall not choose the delegate or delegates to which such ward, precinct, township or district is entitled, or if the apportionment has not been completed or followed in the selection of delegates, the convention shall choose the delegate or delegates to which such ward, precinct, township or district may be entitled.
MCL 168.595