This chapter examines practical forms of citizen engagement occurring in collective problem-solving efforts such as civic enterprises, grassroots initiatives, and self-help groups. Drawing empirical evidence from diverse policy fields, it articulates the distinct experimental and disruptive policy work that citizens enact in these citizens’ governance spaces and challenges dominant interpretations that view them as either a testament to the capacity of citizens to effectively solve complex public problems or a symptom of advanced neoliberalism where states off-load complex problems onto citizens. The chapter moves beyond this dualism to consider the motivations, challenges, available resources, and distinct democratic work enacted by citizens in these spaces of bottom-up governance. It also discusses issues of growth and sustainability over time as well as the implications posed for conventional state and civil society institutions. Citizens’ governance spaces offer important lessons – in terms of both potential benefits and risks – for the project of deepening the quality and reach of citizen participation in modern democratic systems.