The lecture “Belonging to Building,” the second of the Tanner Lectures delivered by Hahrie Han in 2024 at Harvard University, examines how organizational design and the distribution of civic opportunities can strengthen the foundations of democracy. Han uses the phenomenon of megachurches in the United States, such as Crossroads in Ohio, to illustrate how it is possible to achieve massive scale—with tens of thousands of weekly members—through structures that prioritize belonging before belief. Rather than focusing initially on changing ideology, these institutions create communities of welcome and radical hospitality, operating through a “honeycomb” structure composed of thousands of small, intimate, and interconnected groups. These microstructures, exemplified by multiracial groups such as the “Dude Group,” function as democratic laboratories where participants learn to “tarry” (stay together), negotiate deep differences, and act collectively, even in the face of political and social tensions. Han argues that the development of democratic agency does not happen by chance but is fundamentally a problem of supply: people need durable relational spaces where they can practice deliberation and take interpersonal risks. By analyzing the distribution of these opportunities through the Mapping the Modern Agora project, the researcher reveals a significant inequality: wealthier and more educated communities tend to have a greater density of civic spaces. She also observes a broader trend in which modern organizations are increasingly structured around specific causes (belief) rather than broad social ties (belonging). The discussion, enriched by the perspective of organizer Doran Schrantz, emphasizes that while belonging is the foundation, transforming this bond into real political power requires an intentional organizational architecture that connects private stories to strategic public action. In sum, the lecture proposes that the renewal of democracy depends on investing in the creation of spaces that enable citizens to become active subjects and architects of their own future.