No person shall engage in, participate in, aid, form or start any parade, unless a parade permit is first obtained from the Mayor under the provisions of this article, with the following exceptions:
(a) Funeral processions.
(b) Students going to and from school classes or participation in groups in educational activities; provided, that such conduct is under the immediate direction and supervision of proper school authorities.
(c) A governmental agency acting within the scope of its functions.
(d) Processions of lodges, fraternities, sororities, churches, thyrsus by student groups, school processions in connection with school or educational activities, individual school bands on practice marches or maneuvers, or bona fide advertising exhibitions.