Yep, it will indeed be a club anyone can join, as long as they are willing to work on challenging math. I'm not providing a place for kids who are afraid of math to somehow overcome the fear (DS's school is pretty good at honing the basics, their "average" achievement level is very high as shown in state tests). I'm going to give kids who like to think math something challenging to think about, doesn't matter what level they are at, what matters is whether they want to do it.

Definitely won't mention anything about classroom inadequacy, will just say that this is a place where kids who like math get to meet kids with similar interests and have fun. But again, deep down I'm bothered by our constant need to stress "fun" to our kids. Too many kids expect learning to be instant fun...