When did Nightmare Circus happen?

There is no documented event or series called "Nightmare Circus." It's possible that you're thinking of a specific book, movie, or other work of fiction.

To help me understand what you're referring to, could you please provide:

* The name of the specific work of fiction (e.g., "Nightmare Circus" by [author name]).

* The type of media (e.g., book, movie, video game).

* Any other details you remember (e.g., plot, characters, setting).

With more information, I can help you find the answer you're looking for.