By 4:00 p.m.,
Aug. 3, 2012
Write-in candidates who seek precinct delegate positions file Declaration of Intent forms for the August primary. (As an alternative, candidates for precinct delegate may file form with appropriate precinct board on election day before the close of the polls.) (168.737a)

You must file with your local city or township clerk.

Link to the MI SOS for the Precinct Delegate Write-In form

http://www.michigan.gov/documents/Dec-Int-Prc_152628_7.pdf