What are the rituals of Holy Orders?

Holy Orders is when someone is ordained clergy: bishop, priest, or deacon.

Catholic AnswerThe rituals of Holy Orders is the Ordination Ceremony in which the Bishop lays his hands on the individual to be ordained. In ordination to the diaconate, the newly ordained deacon is given a copy of the Gospels to signify his responsibility to read and proclaim them. In ordination to the priesthood, the one being ordained has his hands consecrated with Sacred Chrism and he receives a paten and chalice.

from Modern Catholic Dictionary by John A. Hardon, S.J. Doubleday & Co., Inc. Garden City, NY 1980

Orders, Sacrament of.

The sacrament that, by the imposition of a bishop's hands, confers on a man the grace and spiritual power to sanctify others. There are three forms of this sacrament, also called sacramental orders, namely diaconate, priesthood, and episcopate. They are not, however three sacraments, but only one sacrament that is separately administered with three successively higher sacramental effects. It is certain that every baptized male can be validly ordained, although it would be highly illicit to ordain him before the age of reason. It is likewise certain that every baptized male can be validly ordained a priest without previously being ordained a deacon. However, the more probably teaching is that a baptized male cannot be validly consecrated a bishop unless he has previously been ordained a priest.