Wharf Rats
Wharf Rats are a group of concert-goers who have chosen to live drug and alcohol free.
Their primary purpose is to support other concert goers who choose to live drug-free, like themselves. They announce their presence with yellow balloons, signs, and the Wharf Rats information table. At a set break during Grateful Dead (and related) concerts they would hold 12-step style meetings but are not affiliated specifically with any 12-Step organization and have no requirement for attendance at one of their meetings besides providing some helpful sober fellowship.