During visual presentations, STUDIO POP team reflected on the Trash-to-Cash, a social waste model where “remakers” reuse junk as social currency or unit of exchange. We invited a diverse community of experimenters -community developers, policy makers, local authorities, innovative social entrepreneurs, researchers and educators, and creative youth- to connect waste to design for society. During charrettes, facilitators employed didactical methods based on THINK, PLAY and MAKE to inspire participants. We explored the use of analogic/digital mapping and reactivation of urban voids and waste resources to make green spaces in cities throughout systemic design thinking and processes of co-design in the fields of social technologies, open source architecture, low-tech technologies, pop-up architecture, collaborative research and digital experimentations. We put emphasis on interactivity, civic forum and urban games as key play-elements to to stimulate knowledge and design exchange at group levels. These learning activities followed motivation and learning tasks; unfolding knowledge transfer; and group feedbacks.