Compiled Laws, Chapter 168. Michigan Election Law § 168.591

Sec. 591.(1) Except as provided in subsection (2) and section 532,  1 the state convention of all political parties for the nomination of candidates for state offices in the even numbered years shall commence not less than 60 days before the general November election. The date, time, and location of the state convention shall be designated by the state central committees of the various political parties in their call for a state convention. The calls shall be issued at least 60 days before the August primaries.

(2) In 2012 only, the state convention of all political parties for the nomination of candidates for state offices shall commence not less than 58 days before the general November election. The date, time, and location of the state convention shall be designated by the state central committees of the various political parties in their call for a state convention. The calls shall be issued at least 60 days before the August primaries.