I still don't understand why the club was canceled. That was not justified. Start the club up again, but keep that parent that cause problems out. And if it was me, I would say the autistic boy could come back. When he does, explain to him how his actions were inappropriate and caused the club to stop and that if he wants to stay, he's going to have to behave. Just basically explain things to him in simple terms, firmly, and give him another chance. Without giving him one of the expensive cards. Don't back down on that.