What term is defined as a formal act performed on public occasions?

The term that is defined as a formal act performed on public occasions is "ceremony." A ceremony typically involves a specific set of actions or rituals that are conducted according to established procedures and are often associated with significant events, such as weddings, graduations, or military promotions. These events are characterized by their formal nature and are usually attended by an audience, distinguishing them from other types of gatherings.

Rituals can refer to the symbolic acts performed within a ceremony but are broader and can also occur in private or informal contexts, while traditions refer to cultural practices passed down through generations. Protocol, on the other hand, outlines the rules governing formal interactions, especially in diplomatic or military contexts, but does not solely define the act of a public occasion itself. Therefore, "ceremony" is the most accurate term to describe a formal act performed in public.