Has anybody attempted to write a story without having any idea where it would lead to? Just starting writing about people and having events play out as you write them?
Has anybody attempted to write a story without having any idea where it would lead to?

There's an entire genre for this. It's called literary fiction.
In all seriousness, this is the only way Tom Robbins writes (as I understand it) and he's done okay for himself.
Has anybody attempted to write a story without having any idea where it would lead to? Just starting writing about people and having events play out as you write them?
Then you have to do it. But the editor knows that this outline isn't a hard and fast rule to follow. During the process of writing it, he/she and you might have different ideas of where the story should go or how a character should act.The practical problem with this is, what happens when your editor wants an outline for your second book? (The one you haven't written yet).