Michigan Compiled Laws, Chapter 700. Estates and Protected Individuals Code § 700.1402

Sec. 1402.(1) Except as provided in subsection (2), a person, including a guardian ad litem, conservator, or other fiduciary, may waive notice and consent to the granting of a petition by a writing signed by the person or the person's attorney and filed in the proceeding.If every person affected by the proceeding waives notice and consents in writing to the granting of a petition, the court may enter an appropriate order on the petition without a hearing.

(2) A person for whom a guardianship or other protective order is sought, a ward, or a protected person cannot waive notice. A fiduciary shall not waive or consent on a petition, account, or report made as the fiduciary or in a different fiduciary capacity.