An occurrence in a tale alters the plot or the way we, the audience or readers, see the characters. We'll probably find an event uninteresting and repetitious if it hasn't altered anything. An event that changes the course of history would be called historical. Events can also change how people feel about each other. A fight might make two people enemies for life, or it might just cause them to go their separate ways. Friends might meet at a party where they talk about what causes them to quarrel. Finally, events can change the way people think or act. Someone who is injured in a car accident might use a wheelchair for the rest of his or her life. Or they might recover completely. Events like these can alter someone's mind set or motivation permanently. In conclusion, an event is anything that changes the course of history, destroys friendships, or affects the mental state of people.