Festival is the gathering of society from many places and different backgrounds as the form of citizen's commitment. The festival provides a place for people, stakeholders, industry, artist, volunteer, and participants to interact in a space which is dynamic and give beneficial. The successfulness of festival can create a harmonious togetherness for the visitor and community and establish the personal satisfaction to be a good citizen. The purpose of this research is to find out the citizens' active participation, cooperation between government and stakeholder, and connectivity between individuals in creating successful festival and able to create a social cohesion. This qualitative research with ethnography method was done during the implementation of Krakatau Festival XXVII. Result of the research showed that festival gave a space for citizen's participation, increase the knowledge, getting social experience and increase personal skills to the environment as a shape of citizenship's civilization and strengthen social cohesion.