Those who frenquent
renfaires as customers, often with seasons passes, but who are not part of the performing cast or otherwise work for the renfaire (ie.
rennies). Usually some sort of badges are worn by workers and performers of a renfair as proof that they are employees. Because they add to the general atmosphere of a renfaire, most renfaires encourage festies to wear
garb, thus creating the need for the badges to tell worker from patron.
They're not rennies, they're festies.