In 1911 29 Physicists were Invited. 17 of the 29 won the Nobel Prize in Physics years after the photo was taken. You didn't get invited because you won the Noble Prize, you won because you were invited.
A great mastermind group has a clear platform and expectations. When you attend one, you look around and say, “Wow, I need to raise my game. There are some incredible people here, the level of collective wisdom is so powerful and everyone is so humble. It makes me believe that I have so much growing to do, and if I push myself even harder, there’s a lot of opportunity ahead.”