The following Grands Prix were scheduled to take place in 2011 : An 18-race provisional calendar was announced on 30 September 2010 . The Japanese Grand Prix , originally scheduled for 24 April , was moved to 2 October due to the effects of the Tōhoku earthquake and the Fukushima I nuclear accidents
Tōhoku earthquake
2011 Tōhoku earthquake and tsunami
2011 Grand Prix motorcycle racing season