Voluntary Local Reviews (VLRs) and Voluntary Subnational Reviews (VSRs) are a powerful tool to advance the localization of the Sustainable Development Goals (SDGs). UN-Habitat and UCLG have been working together to support VLRs and VSRs. The two institutions have joined forces to provide local governments and stakeholders with cutting-edge knowledge and exchange opportunities on VLRs. Building on this alliance, the VLR-VSR Days will provide a space for exchange, mutual learning and common reflection for all governments and stakeholders engaged in advancing the localization, monitoring and reporting of the SDGs.