At the time application for a permit is made, where use of municipal grounds is contemplated, the applicant shall deposit with the City Clerk or other designated municipal official a cash bond in an amount to be determined by the City Council, conditioned upon the restoration and cleaning up of the grounds in a manner satisfactory to the City. In the event the grounds are restored and cleaned up properly following the event, the deposit shall be returned; otherwise the same shall be forfeited to the City to the extent of actual costs to the City for restoration and cleaning up of the grounds.