Compiled Laws, Chapter 168. Michigan Election Law § 168.609

Sec. 609. No delegate elected to any city or county convention shall give a proxy to represent him at such convention. All vacancies occurring in any delegation to any convention shall be filled by a majority vote of such delegation: Provided, That such delegation shall not be permitted to fill any vacancy which may occur in its number by any person not a resident of the ward, district, township or precinct, as the case may be, from which such absent delegate was chosen.