I agree that local club racing is cool, a lot of fun and what most people do.
With that said, there are more hard-core R/C racers that do enjoy attending big events and travel to get there.
We had 73 GT racers attend our 2010 GT World Championships last March. Some of them came from as far as Mexico, Chile, Peru, Argentina and Brazil; not to mention Gt racers that made the trip from all over America. Regional, National and World Championships R/C races do exist; they might not be for everyone, but they're a whole lotta of fun too.
Its all about growing the sport, yes?
Setting your cars up to run in the rain should be something all of you should do. Even if all you do is local racing, getting rained out after driving as little as 50 miles to the track flat out sucks.
I look at it this way, our GT cars pretty much have buggy drive trains. Buggies race in dirt & mud, so a little water shouldn't put an end to even local fun. We're running on rubber tires, yes?
Our cars don't have to stop running in the rain like the "foam" tire guys do.
Anyway, thats how we race, rain or shine our GTs don't mind.