The first ring is the public ring. This is the group that is publicly advertised, and where almost any interested individual is welcome to participate or join. At this level people will study, take part in legal group activities, including rituals of a "benign" nature, if it is that kind of group. They will be mentored and their progress monitored. Sometimes they will graduate through higher and higher degrees.
It is within the context of second ring cult activities, that the horrible memories of ritual abuse survivors come from. The intense secrecy of the very existence of this group, is used to discredit the survivor. If the survivor claims that they suffered ritual abuse in a Masonic lodge, at the hands of Masons, for example, the majority of the members of that lodge will vehemently deny that anything like that could have taken place, since they do not partake in those sorts of activities. In actuality, these people are most likely telling the truth, because they are first ring members and are not even aware that there is a second, inner, highly secret ring in existence. Therefore, the survivor is discredited.
This is how recruitment and initiation works with non-DID voluntary initiates into these groups. The second ring groups are comprised in part by these initiates, but are usually led and attended in large part by members who have been raised in this environment, and who are DID with programmed cult identities, who are present at these gatherings. The host personality knows nothing about participating in these activities in their everyday lives.