Participatory democratic practices are often seen as caught between two ideals: inclusiveness and efficiency. On the one hand, they are meant to provide "democratic deepening" by using inclusive processes and giving everyone a voice; on the other hand, they are expected to deliver good results (Gilman, 2012). But can one have both at once? Can deliberation be more than an "endless meeting" (Polletta, 2004)? And can the positive epistemic potentials of deliberation (Landemore, 2013, chap. 4) and other forms of political participation be unlocked in practice?In this paper, we discuss a case study that provides reason for cautious optimism: practices of deliberative 1 decision-making and task distribution in a 2019 "climate camp" in Germany. Here, radical ideals of democratic inclusion and horizontality 2 came up against practical imperatives of efficiency with regard to the day-to-day organization of the camp. We analyze in detail how the participants in this camp dealt with two kinds of tension: the tension between the use of differential knowledge and the risk of thereby creating hierarchies; and the tension between participatory practices and imperatives of efficiency, which, as noted at the outset, has often been seen as a challenge for deliberative participatory practices. We argue that through a number of strategies, the participants of the camp managed to overcome these tensions, with the strategies for overcoming the former tension also helping to overcome the second one. We also discuss what this-admittedly very specific-setting can tell us about deliberative practices more generally speaking.Our paper is situated at the intersection of two sets of literature. First, we draw on ideas from deliberative democratic theory (Cohen, 1989; Gutman & Thomson, 2004;Parkinson & Mansbridge, 2012;Young, 2001) and the literature on the epistemic advantages of democratic practices (Anderson, 2006;Landemore, 2013). Many deliberative democrats have pointed out that social movements can be arenas of democratic deliberation (e.g., Dryzek, 2000;Fraser, 1990).This is an open access article under the terms of the Creat ive Commo ns Attri bution-NonCo mmercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.