Section 1-402
A person, including a guardian ad litem, conservator, or other fiduciary, may waive notice by a writing signed by the person or the person’s attorney and filed in the proceeding. A person for whom a guardianship or other protective order is sought, a ward, incapacitated person or a protected person may not waive notice.
Massachusetts comment
See also G.L. c. 215, § 47 for dispensing with notice by written assent or waiver of notice.