Final answer:
In the town's changed Halloween celebration, Scout would perform in a spectacle, which is a visually striking and impressive events designed to entertain and attract attention.
Step-by-step explanation:
In the given context, Scout would perform in a spectacle for the Halloween celebration in the town. A spectacle refers to a visually striking or impressive event that is designed to entertain and attract attention. It is a form of performance art that often involves theatrical elements, music, dance, and elaborate costumes or props.
The excerpt mentioning the need for a quick win, spontaneity, celebration, and unity through participation suggests that the town is opting for a spectacle rather than a traditional theater production.