Covens in the Twilight Tradition might elect to have a congregational group called Shadow Sisters.
Shadow Sisters is the congregational group for Coven of the Twilight Moon. Those who are in the Shadow Sisters are a) former coven members, initiates in the tradition who cannot make the time commitment needed for regular coven membership, b) very close Pagan friends of the initiates, or c) aspirants, those who seek to join the coven. Shadow Sisters are invited to all-coven meetings and sabbat celebrations, and expected to attend a couple events, every six months, in order to stay in good standing. Shadow Sisters contribute dues whenever possible.