Wash. Rev. Code § 70.108.030
No person or other legal entity shall knowingly allow, conduct, hold, maintain, cause to be advertised or permit an outdoor music festival unless a valid permit has been obtained from the issuing authority for the operation of such music festival as provided for by this chapter. One such permit shall be required for each outdoor music festival. A permit may be granted for a period not to exceed sixteen consecutive days and a festival may be operated during any or all of the days within such period. Any person, persons, partnership, corporation, association, society, fraternal or social organization, failing to comply with the rules, regulations or conditions contained in this chapter shall be subject to the appropriate penalties as prescribed by this chapter.
RCW 70.108.030