306C.23  Special event signs.
  It is lawful to place a special event sign on private property with permission of the owner or person in charge of the property at any time during the period beginning sixty days prior to the date of the special event to which the sign pertains and ending on the day of the special event. Special event signs shall be removed not later than twenty-four hours following the end of the special event. This section does not authorize placement of a special event sign at a location where it may, because of its size, location, content, coloring, or lighting, constitute a traffic hazard or a detriment to traffic safety by obstructing the vision of drivers, by detracting from the visibility of a traffic-control device or by being confused with an authorized traffic-control device.
[C81, §306C.23]
92 Acts, ch 1100, §1