NRS 203.070: Rout and riot.

1. If two or more persons shall meet to do an unlawful act, upon a common cause of quarrel, and make advances toward it, they commit a rout, and are guilty of a misdemeanor.

2. If two or more persons shall actually do an unlawful act of violence, either with or without a common cause of quarrel or even do a lawful act, in a violent, tumultuous and illegal manner, they commit a riot, and are guilty of a misdemeanor.