The City Commission, the Chief of Police, or any other authorized city official shall act on the application for a parade permit within three days, Saturdays, Sundays, and holidays excepted, after filing thereof. If he disapproves the application, he shall mail to the applicant within the three days, Saturdays, Sundays, and holidays excepted, after the date on which the application was filed, a notice of his action stating the reasons for his denial of the permit.