Triwizard TournamentThe Triwizard Tournament is a fictional tournament featured in Harry Potter and the Goblet of Fire. This tournament was established in the late thirteenth to early fourteenth century as a friendly competetion between the three most prastigious magical schools in Europe, Hogwarts School of Witchcraft and Wizardery in Scotland, Beauxbatons Academy of Magic in France, and Durmstrang Institute in Scandanava. However, after the death toll mounted, the tournament ended.
Warning: Wikipedia contains spoilers.
In 1994, the Department of International Cooperation and the Deparment of Magical Games and Sports, resetablished the tournament. Though this time, special precautions were taken. For example, no student under the age of 17 could enter themselves. The judge who would choose which champions were to represent each school, the Goblet of Fire, had an age line around it Dumbeldore , to prevent anyone who was underage putting their name in. However, Barty Crouch Jr, disguised as Professor Moody, entered Harry Potter in the tournament, though he was underage, and tricked the Goblet into forgetting that only three schools could compete, and entered Harry under a separate school. Therefore, the champions were, Fleur Delacour from Beauxbatons, Viktor Krum from Durmstrang, Cedric Diggory from Hogwarts and Harry Potter also of Hogwarts.
Crouch's plan was to make sure Harry won the tournament. The plan successed, and Lord Voldemort was brought back to full power and Cedric was murdered by Peter Pettigrew on Voldemort's orders. Harry, however, escaped and alerted Dumbledore to Voldemort's return.