Hong Kong has become a political city since 1997 after the return of sovereignty from Britain to China, and the issue of democracy and universal suffrage is still a question. Since then, there have been constant demonstrations in the streets to struggle for social justice and true universal suffrage, participated in by thousands of Hong Kong citizens. Interestingly, there are several groups of youngsters from secondary schools and tertiary institutions taking initiatives to participate in these civic and political events. This article aims to report on a qualitative study on how these youth groups are politically socialised to be active participants in petitions and demonstrations, and looks into the role and function of the agents in the socialising process of youth participation in political incidents in Hong Kong. Copyright © 2014 Symposium Journals Ltd.