The Quidditch World Cup 1877 is a mystery – no one knows what actually happened. Although the Quidditch World Cup is said to be held every four years, this particular tournament had to be repeated in 1878, the following year. Therefore, 1877’s Quidditch World Cup is known as “The Tournament that Nobody Remembers” (QWC).
Quidditch World Cup tournaments take place over several months, with the final match falling in July, as in 2014 (QWC) or August, as in 1994 (GF8).
Whatever caused the tournament to disappear from everyone's memory, it did leave behind several mysterious injuries and unexplained relocations of players. Teams known to have participated included the Argentinian National Team, Canada and England.
Lexicon timeline of Quidditch
Lexicon list of World Quidditch teams
From the Web
WizardingWorld.com (Pottermore) features:
Writing by J K Rowling on Imgur (Daily Prophet coverage of the 2014 Quidditch World Cup, originally from Pottermore):
Harry Potter Wiki: Quidditch World Cup