The rites usually listed as the seven of the Lakota are the sweat lodge, inipi, a purification in a domed lodge with heated stones; the vision quest, hanbleceya, crying for a vision, undertaken alone and fasting on a hill; the Sun Dance, wiwanyang wacipi, the great summer ceremony of sacrifice and renewal; the making of relatives, hunkapi; the keeping and releasing of the soul of a dead person; the girls puberty rite, isnati awicalowan; and the throwing of the ball. Yuwipi, a curing ceremony conducted in darkness by a bound practitioner, is not on that list but is widely practised.
That list has a history. It was set out in The Sacred Pipe, published in 1953 by Joseph Epes Brown from conversations with Nicholas Black Elk, and the sevenfold arrangement may owe something to the shape of the book. Black Elk is also the source, through John Neihardt, of Black Elk Speaks of 1932, the most influential book ever published about Lakota religion and one whose reliability is actively disputed. Neihardt worked through an interpreter, shaped the material into literature, and omitted entirely that Black Elk had been a baptised Catholic catechist since 1904 who spent decades instructing others in that faith. Some scholars read him as a traditional holy man whose Catholicism was survival; others as a sincere Catholic whose Lakota material Neihardt romanticised by stripping the Christianity out. The transcripts, published later, support neither reading cleanly.
What is not described here is not an oversight. Sun Dance practice involves flesh sacrifice and vows, and detailed accounts of it, along with accounts of yuwipi and of the vision quest, have repeatedly been published against the wishes of the people who hold them. Lakota authorities have issued declarations objecting to outsiders conducting these ceremonies and to their sale. Elements are restricted by design: some knowledge belongs to a bundle keeper, some to a family, some only to those who have been through the rite. A full description available in a book or online is not evidence that it was ever meant to be there.