The term "curtainraisers" is typically used to describe performances or events that precede the main act or show. However, there are several antonyms that can be used to describe such situations. One antonym is "finale" which refers to the final act or performance of an event. Another antonym is "headliner" which refers to the main performer or act in a show. "Closing ceremony" is another antonym that can be used to describe the final act of an event. Similarly, "ending credits" refer to the final credits of a movie or show. In essence, these antonyms describe the final stages or main attractions of a performance or event.