For many short stories it’s clearly true that a single event organizes the story.
Think about John Updike’s highly anthologized story “A&P,” about Sammy, a teenager who quits his job in protest for the way two girls were treated by his manager (you might have read it in high school). There is clearly a central event to the story, the moment Sammy quits his job, rebelling against the value system of his parents.
Or Shirley Jackson’s story “The Lottery” (if you didn’t read this in high school, you must have been home schooled!), a Hunger Games-esque story about a lottery held in a small town that ended (spoiler alert if you somehow missed this one) with the public execution by stoning of the “winner.” It’s very clear that this story revolves around a central event.