|"Is this all real? Or has this been happening inside my head?"
The subject of this article is a real-life person, group, company, product, or creative work that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really exists), and, as such, details contained in this article may differ from real world facts.
The 1809 Quidditch World Cup, and the subsequent Attack of the Killer Forest orchestrated by Niko Nenad, took place there, near a forest at the very edge of the plain. The forest was destroyed after the trees came to life and were killed by the wizards in a bloody battle.