It shall be unlawful for any person to knock at the door of, to ring the bell of, or otherwise to call upon more than one residence, without invitation, between the hours of 10:00 p.m. and 8:00 a.m. of the following day. This section shall not be interpreted to grant any person permission to enter upon private property. (Ord. 484 § 3. 2002 Code § 3-1.46).