Section 28-111.1. General

The  commissioner is authorized to issue a permit
  for temporary structures and  temporary  uses.  Such  permits  shall  be
  limited  as  to  time  of service or use, but shall not be permitted for
  more  than  30  days.  The  commissioner  may   grant   extensions   for
  demonstrated cause.
    Exception: No permit shall be required for:
    1.  The  erection  and  use  of temporary tents of less than 400 gross
  square feet (37 m{2}) for not more than 30 days.
    2. The erection and use  of  temporary  platforms,  reviewing  stands,
  outdoor  bandstands  and  similar miscellaneous structures that cover an
  area less than 120 square feet (11.16 m{2}), including connecting  areas
  or  spaces  with a common means of egress or entrance, for not more than
  30 days.