For my son, the math club is only once per month plus they do a few tournaments in which he started to participate. He is quite advanced and I am no longer able to add much value or talk to him about the math he is working on and that is what he likes so much about the math club - just being around others that like math.
We let our son say whether he wants to go as it is on Saturday's but he always is very excited to go.
Also, the math club has a few college math professors that do the instruction so that is a big advantage for him.
Best of luck!