The Rock in Japan Festival is an annual three-day rock festival held during early August at the Hitachi Seaside Park, in Hitachinaka, Ibaraki, Japan, organized by Rockin'on. Rock in Japan Festival is the biggest rock festival in Japan in terms of attendance. Performances 2012 2013 External links Summer festivals Rock festivals in Japan Recurring events established in 2000 Tourist attractions in Ibaraki Prefecture