Section 85. The board of education may adopt guidelines to implement the provisions of sections eighty-two to eighty-four, inclusive. School committees shall adopt rules and regulations consistent with guidelines of the board of education and the provisions of sections eighty-two to eighty-four, inclusive. The rules and regulations to be made by school officials shall be established only after notice to public school students and after a public hearing at which students' views, shall be presented and shall be taken into consideration by such officials. Said rules and regulations shall provide that, notwithstanding the existence of the rights and responsibilities described in the three preceding sections, school committees or school officials may take necessary action in cases of emergency. Students may petition for a hearing, to be held as soon as practicable after such emergency, as to whether such rules and regulations shall be revoked or modified.