The event will open with a keynote lecture linking climate action and environmental stewardship to Reurb, demonstrating how this public policy can serve as a catalyst for urban transformation. Discussions will address historical and contemporary challenges faced by Brazilian cities, including precarious housing, lack of sanitation, unnamed streets, and absent postal codes, which reflect the social invisibility of millions. In this context, Reurb emerges as a starting point to reverse these conditions. The Instituto Reurb’Delas will present an innovative perspective, emphasizing that land regularization is not merely a technical solution but a tool for social justice. Achieving real impact requires engagement with communities, respect for local specificities, and integration with policies on housing, mobility, environment, and economic development. On World Cities Day, the event highlights Reurb as a strategic pathway toward more inclusive, sustainable, and people-centered cities.