if it's public property or private property that hasn't asked you to leave yet, then yes, OC is legal in Michigan. i have no idea if the police will be called or not. all i can say is if no one breaks the law, no one will be arrested.
read the Michigan state police updates (especially the fourth one) in this thread for a crash course in legal OC:
ETA: i should have said if no one breaks the law no one SHOULD be arrested. there have been OCers on this forum arrested for doing nothing illegal...