Compiled Laws, Chapter 168. Michigan Election Law § 168.592

Sec. 592. (1) Except as provided in section 532,  1 the county conventions of all political parties for the election of delegates to a state convention for the nomination of state officers in the even numbered years shall be held not less than 8 days nor more than 25 days after the August primaries.

(2) All county conventions of a political party shall be held on the same day throughout the state. The date shall be designated by the state central committee of a political party in its call for the state convention. The place and hour of meeting of a county convention shall be designated in the call issued by the county committee of the political party in the county, which call shall be issued not less than 45 days before the August primaries. The number of delegates to the state convention to which the political party in the county is entitled shall be chosen at the county convention.

(3) In all counties having or which may hereafter have 2 or more congressional districts or parts of congressional districts within the boundaries of the county, the congressional districts or a part of a congressional district within the counties shall each be considered a county within the provisions of this section for the holding of the county conventions provided for in this section, and shall be in place of the county convention. The nominee for congress of the congressional district in the preceding primary election, the county chairperson, and the county secretary of the several political parties shall constitute a committee in each congressional district to name the temporary chairperson of the first district convention held under this act. Thereafter, the district chairperson shall act as temporary chairperson. The convention shall organize the same as county conventions and shall elect delegates to the state convention. The chairperson and secretary of the convention shall certify to the state central committee the names and addresses of the delegates elected, and, when certified, those delegates shall become the delegates from the district to the state convention.