After the filing of the petition with the court, the court shall give notice of the hearing to the following persons:
(a) the individual for whom involuntary commitment is sought;
(b) the parent, spouse, personal representative, or legal guardian, if any;
(c) the person filing the petition;
(d) the attorney representing the individual for whom involuntary commitment is sought;
(e) the head of the treatment facility if the individual is in a treatment facility; and
(f) any other person the court determines shall have notice of the proceedings.
The notice shall include the date, time, and place of hearing, a clear statement in plain and simple language of the purpose of the proceedings, and the possible consequences to the individual for whom involuntary commitment is sought; a copy of the petition or affidavit and supporting certificates of the examining physician; and the right to the assistance of an attorney, and the appointment of an attorney if the individual named in the petition is unable to afford one.