We present findings from a year-long engagement with a street and its community. The work explores how the production and use of data is bound up with place, both in terms of physical and social geography. We detail three strands of the project. First, we consider how residents have sought to curate existing data about the street in the form of an archive with physical and digital components. Second, we report endeavours to capture data about the street's environment, especially of vehicle traffic. Third, we draw on the possibilities afforded by technologies for polling opinion. We reflect on how these engagements have: materialised distinctive relations between the community and their data; surfaced flows and contours of data, and spatial, temporal and social boundaries; and enacted a multiplicity of 'small worlds'. We consider how such a conceptualisation of data-in-place is relevant to the design of technology.

The financial crisis and austerity politics in Europe has had a devastating impact on public services, social security and vulnerable populations. Greek civil society responded quickly by establishing solidarity structures aimed at helping vulnerable citizens to meet their basic needs and empower them to co-create an anti-austerity movement. While digital technology and social media played an important role in the initiation of the movement, it has a negligible role in the movement's ongoing practices. Through embedded work with several solidarity structures in Greece, we have begun to understand the 'solidarity economy' (SE) as an experiment in direct democracy and self-organization. Working with a range of solidarity structures we are developing a vision for a 'Solidarity HCI' committed to designing to support personal, social and institutional transformation through processes of agonistic pluralism and contestation, where the aims and objectives of the SE are continuously re-formulated and put into practice.

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Solidarity organizations in Europe are committed to building a more socially just society through a better configuration of democracy, politics and economy. In this paper, we describe our efforts to contribute to the sociopolitical designed innovation of solidarity movements through the establishment of a research lab embedded in, and operating within, the solidarity economy. We describe three cases that span the polarities of everyday and expert design, and contribute to the scaling out of social innovations. We use these cases to exemplify the strategies and tactics that emerge from the ongoing negotiation of 'infrastructuring' work with solidarity organizations. Finally, we discuss how guerilla infrastructuring, designing coalitions, and spanning design polarities can contribute to HCI and design for social innovation more generally.