On June 2nd, the MAINCODE project officially kicked off in Halandri, Greece. Hosted at the Municipal Council Hall, the Local Opening Event marked the beginning of a collaborative journey toward more resilient and nature-based schoolyards. Organised by Commonspace Coop and the Municipality of Halandri, we presented the project’s goals, methodology, and upcoming participatory activities, starting with the co-design of the first Urban Climate Shelter in a local schoolyard during the 2025 – 2026 school year. Together with local stakeholders, we explored how extreme climate events affect Halandri’s public schools and mapped shared experiences with the local community.