Qué es ceremony? Qué es ceremony? A formal act or set of acts performed as prescribed by ritual or custom: a wedding ceremony; the Japanese tea ceremony. A conventional social gesture or act of courtesy: the ceremony of shaking hands when introduced. A formal act without intrinsic purpose; an empty form: ignored the ceremony of asking for comments from other committee members. Strict observance of formalities or etiquette: The head of state was welcomed with full ceremony.