Mich. Comp. Laws § 168.541
If upon the expiration of the time for filing petitions in any primary, the secretary of state shall find within a given district that there is no opposition for any office upon any ticket, he shall forthwith give notice to the clerk of the several counties embraced, at the same time certifying the names of the candidates and the office to which they aspire to the state board of canvassers, who shall declare them the nominees for the respective offices, and shall give notice to the clerk of the several counties embraced in such district, and if the clerk shall find that there is no opposition for any office upon any ticket for a county office, then it shall be the duty of such clerk to forthwith give notice to the several city and township clerks interested that a primary will not be held as contemplated, but in no event shall a primary election be abandoned in any township, city, county or district wherein there shall be opposition for any office upon any ticket.
MCL 168.541