ceremony
noun(cer-e-mo-ny)
a formal event performed on a special occasion
Examples:
A ceremony commemorating Pearl Harbor. 
ceremony
noun(cer-e-mo-ny)
any activity that is performed in an especially solemn elaborate or formal way
Examples:
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. 
ceremony
noun(cer-e-mo-ny)
the proper or conventional behavior on some solemn occasion
Examples:
An inaugural ceremony.