Every person who, not being a student, or not being a teacher, school administrator, or employee at such school, or not being at such school at the invitation of a teacher, school administrator, or employee of such school, shall loiter upon any school grounds, including any school parking lot at any time when such school is in regular or special session or one hour before or one hour after such regular or special session, and who fails promptly to leave such school grounds after being requested to do so by a police officer, a teacher at such school, or the principal or vice principal at such school, or who shall fail to remain away from such school grounds after having left the school grounds pursuant to such request, shall be guilty of the offense of vagrancy, upon conviction thereof, shall be punished by fine of not more than three hundred dollars, or imprisonment of not more than ninety days, or by both such fine and imprisonment. (Ord. 291 § 2, 1971)