Ceremony
WordNet
noun
(1) Any activity that is performed in an especially solemn elaborate or formal way
"The ceremony of smelling the cork and tasting the wine"
"He makes a ceremony of addressing his golf ball"
"He disposed of it without ceremony"
(2) The proper or conventional behavior on some solemn occasion
"An inaugural ceremony"
(3) A formal event performed on a special occasion
"A ceremony commemorating Pearl Harbor"