As Cities and Social Entrepreneurs: A Playbook for Catalytic Collaboration has shown, when cities, social entrepreneurs and communities collaborate, they can significantly accelerate progress toward solving seemingly intractable social problems, and simultaneously making progress towards achieving the SDGs. We identified eight common practices that can be tailored to join forces, and tap into a shared abundance of resources: talent, funding, regulatory and policy tools, human resources, experiences, and empowered citizens. Together, local governments, social entrepreneurs and the communities they serve (and empower!) can have an immediate and sustained impact to improve the quality of life in cities.