Mich. Comp. Laws § 700.1402: Notice; waiver; order.

Sec. 1402.

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.

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.