When an occasion is extremely formal and full of rituals, you can call it ceremonial. Your cousin's fancy wedding and your friend's bar mitzvah are both ceremonial events.

The ritual of a new queen being crowned is ceremonial, with its pomp and formality. The way your family celebrates Thanksgiving might feel ceremonial to you as well, if everyone takes it very seriously and sticks to firm rules about what food to eat and who carves the turkey. Ceremonial originally described a purely religious ritual, from the Latin caerimonia, "holiness or sacredness."

Definitions of ceremonial

adj marked by pomp or ceremony or formality

“a ceremonial occasion”
ceremonial garb”
being in accord with established forms and conventions and requirements (as e.g. of formal dress)

n a formal event performed on a special occasion

ceremonial occasion, ceremony, observance
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formal ceremony about important occasions
a ceremony at which a dead person is buried or cremated
hymeneals, nuptials, wedding, wedding ceremony
the social event at which the ceremony of marriage is performed
pageant, pageantry
a rich and spectacular ceremony
a ceremony in which something (as a building) is dedicated to some goal or purpose
a ceremony accompanying the start of some enterprise
commemoration, memorialisation, memorialization
a ceremony to honor the memory of someone or something
military ceremony
a formal ceremony performed by military personnel
induction, initiation, installation
a formal entry into an organization or position or office
(usually plural) a ceremony that involves processions and speeches
fire walking
the ceremony of walking barefoot over hot stones or a bed of embers
formalities, formality
a requirement of etiquette or custom
a public ceremony on Maundy Thursday when the monarch distributes Maundy money
a ceremonial feast held by some Indians of the northwestern coast of North America (as in celebrating a marriage or a new accession) in which the host gives gifts to tribesmen and others to display his superior wealth (sometimes, formerly, to his own impoverishment)
inaugural, inauguration
the ceremonial induction into a position
burial, entombment, inhumation, interment, sepulture
the ritual placing of a corpse in a grave
sky burial
a traditional Tibetan funeral ritual in which the corpse is exposed to the open air to be eaten by sacred vultures
a new dedication
coronation, enthronement, enthronisation, enthronization, investiture
the ceremony of installing a new monarch
bar mitzvah
(Judaism) an initiation ceremony marking the 13th birthday of a Jewish boy and signifying the beginning of religious responsibility
bas mitzvah, bat mitzvah, bath mitzvah
(Judaism) an initiation ceremony marking the 12th birthday of a Jewish girl and signifying the beginning of religious responsibility
commencement, commencement ceremony, commencement exercise, graduation, graduation exercise
an academic exercise in which diplomas are conferred
Type of:
affair, function, occasion, social function, social occasion
a vaguely specified social event

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