The term 'walked onstage' can be summarized as the action of entering a stage in a theatrical performance. This is usually done by an actor or actress, who will walk onto the stage to begin their part in the play. It can also refer to a musician or other performer entering the stage to perform. The term can also be used to describe someone entering a public speaking event, such as a lecture or presentation. In all cases, the person is entering the stage to perform or present something.