During proceedings involving petitions or warrants alleging that a juvenile is delinquent, including proceedings on appeal, a victim may remain in the courtroom and shall not be excluded unless the court determines in its discretion, that the presence of the victim would impair the conduct of a fair trial. In any such case involving a minor victim, the court may permit an adult chosen by the minor victim to be present in the courtroom during the proceedings in addition to or in lieu of the minor’s parent or guardian. The attorney for the Commonwealth shall give prior notice of any such proceedings and changes in the scheduling thereof to any known victim and to any known adult chosen in accordance with this section by a minor victim at the address or telephone number, or both, provided in writing by such persons.