This project focuses on creating a participatory mixed reality space, situated in social contexts within urban smart cities. This study explores audiences' social interactions and experiences with tactile engagements from their smart devices and a form of interactive media façade. The association between NodeJS, Websocket.io-to-OSC and TouchDesigner designs integrated with the developed computer projection mapping system supports the participatory mixed reality environment. A framework is also developed from the concepts of the viewer as co-creators, the interactive system as facilitator and motivation as creating a sense of belonging: 'being connected' - social presence. The framework is to seek new perspectives from the recent growing trend of participatory culture in public spaces. This project supports the collective interaction to redefine and reshape to whom, with how and what we are sharing together in the cocreation through social interaction and experience. It is vital that people learn how to engage when engaging with each other - together within the participatory mixed reality space.