One of the largest robotics competition, Robocup, took place in Graz, Austria, on June 2009 and lasted 5 days. This years event was organized by Graz University of technology. 408 teams, approximately 2000 robots and 2300 humans participated in the event. The main areas of competition were soccer, dancing and domestic chores. The current platform for soccer was the NAO robot form Aldebaran robotics.
Here is the official brochure from the robocup organization.
And here is the final match from last year’s competition: