The Nada Kenka Matsuri (Open Sea Brawl Festival) is an annual grand fall festival held October 14-15 at Matsubara Hachiman Shrine in the neighborhood of Shirahama in Himeji. As the name implies, the festival is a boisterous event that mixes participants with spectators, including a Shinto ritual with 3 mikoshi (portable shrines) smashing into each other and a float battle that involves intricately decorated floats from each town mashing together. When night falls, the floats are illuminated with electric and fire lanterns, creating a bright and lively atmosphere. The festival is designated an Important Intangible Cultural Property of Gunma prefecture.