This entry describes an office and does not describe any ceremony. That is deliberate, and the reasoning is worth setting out so that it is not mistaken for an omission.
Detailed accounts of Dine chantways, of Lakota ceremony, of Pueblo ritual and of much else were recorded and published in the nineteenth and twentieth centuries by ethnographers who were told not to publish them, or who never asked. The nations concerned have objected, repeatedly, formally, and in writing. Those objections have not been withdrawn because the material has been in libraries for a century.
The argument that publication is now harmless because the material is already available gets the situation backwards. The availability is the injury. Repeating it does not neutralise an old wrong; it extends it, and it transfers the benefit to whoever is doing the repeating.
There is a second reason, narrower and equally sufficient. Ceremonial knowledge in these traditions is held by particular people who are responsible for it. A description assembled from published sources by someone outside that chain is not authorised by anyone, and is frequently wrong in ways the writer cannot detect.
So the entry says what can be said: that these specialists are trained over years, that the training is by apprenticeship, that the authority is recognised by a community and can be withdrawn by it, and that competence is specific rather than general. What the ceremonies consist of is not ours to publish.
The same reasoning is applied elsewhere in this atlas, to closed initiations in West African and Haitian traditions, and to five mantras that are recorded as restricted with their formulae deliberately absent.