The reasons are quite clear in the book. Briefly, this was part of Voldemort's plan, to get Harry Potter into his power, use his blood for his "rebirth", and then kill him. This last part of Voldemort's plan failed.
harry potter and the goblet of fire. it's a triwizard tournament
The Triwizard Tournament
He wins the Triwizard Tournament.
If you're asking about the competition in Harry Potter and the Goblet of Fire, it was the Triwizard Tournament.
Harry Potter and the Goblet of Fire. It was during the first task of the Triwizard Tournament.
The Quidditch Tournament The Triwizard Tournament The Yule Ball Holiday feasts
The Tri-Wizard Tournament.
The four champions of the Triwizard Tournament were Harry Potter, Cedric Diggory, Fleur Delacour, and Victor Krum.
That would be Harry Potter and the Goblet of Fire. In which the Three Schools participate in the Triwizard Tournament.
The fourth book, Harry Potter and the Goblet of Fire.This book follows Harry as he competes in the Triwizard Tournament.
Poliakoff is the surname of a Durmstrang student who came to Hogwarts during the Triwizard Tournament.
Three, Hogwarts Beauxbatons and Durmstrang