(Legislative History: Ordinance No. 2018-016, 9/4/18 (Sections 4-18-300—4-18-800))
It shall be unlawful and constitute a public nuisance for any responsible person(s) to cause or allow an unruly gathering to occur on any private property within the City. An unruly gathering may be abated by the City by all reasonable means including, but not limited to, an order requiring the unruly gathering to be disbanded, the issuance of citations, and/or the arrests of any law violators under any applicable local laws and State statutes.
It shall be unlawful and a violation of this Chapter for any person to attend or participate in an unruly gathering in a manner that contributes to the unruly gathering by engaging in conduct that causes a substantial disturbance of the quiet enjoyment of private or public property in a significant segment of a neighborhood, or presents a threat to the health and safety of those in attendance, responding enforcement personnel, or occupants of immediately adjacent properties, as defined in Section 4-18-200(e) of this Chapter.
When a police officer or other duly authorized City employee determines that an unruly gathering is occurring or has occurred, and either the unruly gathering was hosted by a person or persons other than the owner, or responding personnel are unable to determine whether the owner was the host, the police department shall mail a notice to the owner of the property where the unruly gathering occurred. Notice to the property owner(s) will be issued pursuant to Section 1-12-410 of this Code.
If the City is required to respond to an unruly gathering, the following persons shall be jointly and severally liable for civil penalties as set forth in Section 4-18-700 of this Chapter, in addition to liability for any injuries to City personnel or damage to City property:
(a) 
The person or persons who own the property where the unruly gathering took place; provided, that notice has been mailed to the owner of the property as set forth herein.
(b) 
The responsible person or persons; provided, however, that if the responsible person is a juvenile, then the parents or guardians of the juvenile will be jointly and severally liable for penalties and liabilities herein.
(c) 
Any persons in attendance at and engaging in conduct contributing to the unruly gathering as set forth in Section 4-18-200(e) of this Chapter.
(d) 
Nothing in this section shall be construed to impose liability on a property owner or responsible person for the conduct of persons who are present without the express or implied consent of the property owner/responsible person as long as the property owner or responsible person has taken reasonable steps, including, but not limited to, requesting police assistance to exclude such uninvited participants from the property. Where an invited person engages in conduct which the property owner or responsible person could not reasonably foresee and the conduct is an isolated instance of a person at the gathering violating the law which the property owner or responsible person is unable to reasonably control without the intervention of the police, the unlawful conduct of that person shall not be attributable to the property owner or responsible person for the purposes of determining whether the gathering constitutes an unruly gathering.
(a) 
Any citation issued for an unruly gathering as defined in Section 4-18-200(e) of this Chapter shall be deemed to be prima facie evidence of a violation of the provisions of this Chapter for purposes of administrative enforcement.
(b) 
Any violation of this Chapter shall be a misdemeanor and is subject to criminal, civil or administrative enforcement as provided in this Code. Each hour such violation is committed or is permitted to continue shall constitute a separate offense and may be punishable as such.
(c) 
Section 4-18-200(b) of this Chapter shall not be applicable to a property owner when they do not reside or occupy the property where the unruly gathering has occurred and the property owner is entitled to receive rent or other valuable consideration for the use of the property. A property owner that meets the above conditions and continues to allow violations of this Chapter shall be guilty of an infraction and may be subject to civil or administrative enforcement in accordance with Chapter 1-12 of this Code.
(d) 
If administrative enforcement is initiated in accordance with Chapter 1-12, penalties shall be assessed against all responsible persons, and individuals liable for the City's intervention to abate an unruly gathering pursuant to Section 4-18-300 of this Chapter.
(1) 
Violation(s) of this Chapter will result in a penalty pursuant to Section 1-12-415 of this Code.
(2) 
The administrative citation penalties provided herein shall be in addition to any other penalties imposed by law for particular violations of law committed during the course of an unruly gathering.
(e) 
Once a police officer or other duly authorized City employee has determined there has been a violation of this Chapter, the owner(s) of the property where the violation occurred may be subject to administrative action for allowing a subsequent violation of this Chapter to occur on the property, provided the property owner has received notice as required by Section 4-18-500 of this Chapter, and at least 14 days have elapsed since the date the notice was mailed to the property owner(s). The City may defer or delay administrative action against any property owner who can demonstrate due diligence in preventing future unruly gatherings, such as evicting those responsible for such gatherings.