Ceremony

[Raeanne Dimick]

Ar act or series of acts, often of a symbolical
character, prescribed by law, custom, or authority, in the conduct of
important matters, as in the performance of religious duties, the
transaction of affairs of state, and the celebration of notable events;
as, the ceremony of crowning a sovereign; the ceremonies observed in
consecrating a church; marriage and baptismal ceremonies.

[Vania]

a late 90s shoegazing/postpunk band out of Philadelphia

[Oralee]

(a set of) formal acts, often fixed and traditional, performed on important social or religious occasions:

[Tanya Shivari]

A formal religious or public occasion, typically one celebrating a particular event or anniversary.