This guidebook is for people who want to change the world. It's for social change leaders who understand the power of convening the right group of people, and who believe that collective intelligence trumps individual smarts when it comes to solving shared problems. It's for those who know that there is an art and a science to convening and want to get better at both. Ultimately, this guidebook is a practical toolkit to help a world-changer who is taking on the role of lead convening designer. This guidebook is organized around the most common building blocks of constructing any convening: deciding whether to convene, clarifying a "north star" purpose, and making a bevy of design choices that flow from that purpose. It offers a set of design principles, key questions, and critical issues to be considered and customized for your situation.