I'm not sure about over in the USA, but here in Australia, there's nothing for junior western riders to have a social day out, well not that I know of anyway. We have pony club over here, and its the usual dressage, showjumping etc.
But your idea for having something like that for western riders is a good one!
Umm...I honestly don't know. Nothing that I've heard of before. All I know of for western riders is 4H, and that's also for English riders and all kids, so I dunno. I really wish there was though :) Western riders don't really have the same stuff as English. It's not really fair :P Let me know if anyone finds anything!
Hi I am in a western riding club that is kind of like a pony club it is called the Rincon Riders it is $10 a year and and they have a huge arena that you can treiler your horse to they do playdays and club rides all over the place it is really cool you should look into it and if you want info you can just ask me