(1)in any case of an actual or intended religious or ceremonial or corporate display or exhibition or organised assemblage in any street or public place, as to which or the conduct of, or participation in, which, it shall appear to the competent authority that a dispute or contention exists, which is likely to lead to grave disturbance of the peace, the competent authority may give such orders as to the conduct of the persons concerned towards each other and towards the public as it shall deem necessary and reasonable under the circumstances, regard being had to the apparent legal rights and to any established practice of the parties and of the persons interested and all persons concerned shall obey such orders.
