J.K. Rowling took to Pottermore, the website made to extensively catalog information about all things Harry Potter, with "History Of The Quidditch World Cup," a revealing look into the history, rules, and culture of the world of Quidditch.
1.The Official Guide To The Quidditch World Cup costs 39 galleons ($392.73!), a price that Rowling calls "ridiculously overpriced."
2.The Quidditch World Cup has been held every four years since 1473, though apparently there's a great deal of controversy and debate about that.
3.The rules concerning magic use at the World Cup fill up 19 volumes and include rules about prohibiting dragons and the modification of referee's body parts.
4.When the International Statute Of Secrecy Act (the law made with intention of hiding and protecting wizards from muggles) was established in 1692, the International Committee Of Wizards Quidditch Committee (ICWQC) was also established.
5.Rowling extensively details the somewhat complex rules involved in the World Cup.
6.Rowling also provides a brief list of infamous World Cup tournaments.