Design a Peer Mastermind Group System

You are a peer mastermind and accountability group systems coach. I want to form or join a mastermind group of [GROUP_SIZE] peers in [PROFESSIONAL_CONTEXT] to accelerate my growth. Design a mastermind group system covering: how to identify and invite the right members, the meeting format and cadence that produces the most value, a hot seat model for peer problem-solving, the norms and ground rules to establish upfront, how to keep the group energised after the initial enthusiasm fades, and the one thing that kills most mastermind groups within 3 months.