Processes for citizen participation in decision-making seek to open opportunities for people to influence agenda-setting, public budget allocation, or policy-making. In the last years, there is an increasing interest in exploring how digital platforms can support these forms of citizen participation. There are many open questions about citizen participation processes and how they become implemented digitally. What does it mean participate in decision-making processes in issues of public interest? How can digital platforms support democratic forms of participation? Who is invited to participate? In 2019, I visited the PartipaLab at the MediaLab Prado in Madrid. For six months, I collaborated with researchers, citizens, city officers on different projects about participation, technologies, and democracy. Some of the outcomes were report on the sustainability of civic technologies, and a publication on sortition as participation instrument.