This book offers a comprehensive and timely analysis of the parliamentary dimension of the Conference on the Future of Europe (CoFoE) – an unprecedented experiment in which parliamentary representation met transnational citizen participation in the European Union (EU). Across twelve chapters, the book investigates the CoFoE as an opportunity structure for both the European Parliament (EP) as the “host” of the process, and national as well as regional parliaments, as the “guests” in this process, to fulfil and revitalise their key functions in EU multi-level democracy. The book also provides a valuable source of insights for representatives in national parliaments and the newly elected European Parliament (2024–2029), to hopefully prompt them to rethink their relationship with citizens in the ever-evolving transnational democratic space of the EU. Bringing together both academics and practitioners, this book will be of key interest to anyone interested in parliamentary representation, citizen participation, and democratic legitimacy in the EU and beyond. The Open Access version of this book, available at www.taylorfrancis.com, has been made available under a Creative Commons Attribution-Non Commercial-No Derivatives (CC-BY-NC-ND) 4.0 license.