As the public reading campaign has been popular, the book festival, a sociocultural event in relation to the book and reading, becomes a growing public interest. The book festival which could be diversified by each community and its environment would be understood in the perspective of the performance of public library, the diffusion of public reading campaign and the sociocultural togetherness of the community. In that, this study focuses on the book festival of Seongbuk-Gu, Seoul, held in 2015. Specifically, this study looks into the theoretical underpinnings and the background of book festival, examines the case of the '2015 Seongbuk-Gu Book Festival' systematically, and analyzes the factors that influence the book festival, in order to enhance our understanding of the book festival in general.