1. The panel will discuss strategies for creating thriving startup ecosystems and densities in cities, drawing from examples of hubs in Chicago, Austin, Moscow, and Washington D.C. 2. A key theme is the importance of central hubs for convening startups and driving activity, though approaches differ between non-profit and for-profit models. 3. Panelists will debate questions around whether density requires physical hubs, how to best curate communities, attracting startups from other cities, and integrating accelerators and investments into hubs.