The World Freestyle Kayaking Championships are held every two years. This year's event is June 20–26 on the Isar River in Plattling, Germany. The 2009 event was in Thun, Switzerland.
These videos of the 2009 Thun championships provide an excellent preview of what you can expect at the 2013 world championships in the Nantahala River Gorge.
Plan now to be in Bryson City, NC USA September 2–8, 2013 for this exciting spectator event.