Is there some kind of nationwide high school "math club" or something? Kinda like the Science Olympiads, or the 24 clubs there used to be (or may still be) At

Is there some kind of nationwide high school "math club" or something? Kinda like the Science Olympiads, or the 24 clubs there used to be (or may still be) At the college level, I'm sure there's something too. I'd try to find that type of organization, and reach out to their national office. From there, and what type of "contest" or promotion you'd like to try, I'm not really sure. I'd try to reach out to math teachers as well, ontop of your direct audience (I'm assuming the kids) they tend to have a big influence on what their students are exposed to.