This document analyzes how two participatory culture groups, the Harry Potter Alliance and Nerdfighters, translate members' cultural interests into political outcomes. It examines three mechanisms they use: 1) Tapping into shared passions for popular culture to develop civic identities and agendas, 2) Encouraging creative production, especially for political expression, and 3) Creating spaces for informal discussions about current events and politics. Through case studies and interviews, the report explores how these groups scaffold young people's cultural engagement into participatory political action.