A street or sidewalk use permit may be revoked or modified, if the sponsor fails to comply with any of the requirements of this Chapter, of the Street and Sidewalk Use Administrative Regulations, or the conditions set forth in the application or permit.  If a street and sidewalk use permit is subject to revocation pursuant to this Section, on the day of the street and sidewalk use to which the permit pertains, the Portland Bureau of Transportation will attempt to contact or notify the sponsor, the organizer or the day of use coordinator, if any, as provided on the permit application, and attempt to resolve any problems before revoking the permit.  If resolution is not possible the permit may be revoked.