The World Diplomacy Championship or WDC, or Worldipcon is a face to face Diplomacy competition created by the british Hobby in 1988. initially disputed every two years the frequency become yearly in 1994 under a french impulse

excert from an article of Iain Bowen (full article)

World Dip Con started off as an idea mooted by Simon Billeness in the US zine House of Lords as an idea that Britain could host a DipCon. This idea was quickly crushed as the idea of the North American Championships ‘crossing the pond’ proved to be anathema to the majority of the contributors to HoL. However, the idea didn’t go away as many people expressed an interest in attending a convention in the United Kingdom. From there, the next suggestion was World Dip Con and Manorcon (the largest UK Diplomacy convention) agreed to test the water with a World Dip Con in 1988. There seemed to be little objection – so Manorcon 88 became World Dip Con.

This convention was very well publicized (thanks to Larry Peery, the then editor of Diplomacy World and Simon Billeness and attracted over 300 gamers mainly from the United Kingdom but with attenders from Ireland, the Netherlands, Belgium, Germany, the United States, Canada and Australia. The Diplomacy tournament was held over two rounds and had 188 players and was won by Phil Day from the United Kingdom.

People enjoyed it so much that as decision was taken to rotate World Dip Con around the world.