The ifmar ( international federation of model auto racing)worlds are run every 2 years on a rotating venue between the four governing bodies. R.O.A.R (radio operated auto racing) which covers North America, E.F.R.A. European federation of radiooperated autos) which covers Europe and F.E.M.C.A. (Far east model car association) which covers the far east and F.A.M.A.R. (fourth association of Model auto racing) which covers South america and Mexico. Each governing body is alloted approx. 50 race entries. Here are some sites to look at.
http://www.roarracing.com/
http://www.ifmar.org/
And I saved the best for last.
http://liverc.rccars.com/