ceremonial rites
ceremonial
/ˌser-ə-ˈmō-nē-əl/
adjective
marked by, involved in, or belonging to ceremony : stressing careful attention to form and detail
having no real power or influence
ceremonial ceremonious formal conventional mean marked by attention to or adhering strictly to prescribed forms. ceremonial and ceremonious both imply strict attention to what is prescribed by custom or by ritual, but ceremonial applies to things that are associated with ceremonies , ceremonious to persons given to ceremony or to acts attended by ceremony.
noun
a ceremonial act, action, or system