ceremonial
sɛrɪˈməʊnɪəl
adjective
relating to or used for formal religious or public events.
a ceremonial occasion
formal,official,state,public,ritual,ritualistic,prescribed,set,stately,courtly,solemn,dignified,celebratory,sacramental,liturgical
noun
the system of rules and procedures to be observed at a formal or religious occasion.
the procedure was conducted with all due ceremonial