Since Uwajima City and Honolulu, Hawaii have a sister-city affiliation and Ehime Prefecture and the State of Hawaii are also in the same kind of relationship, volunteers from Maruho ushioni hozonkai (the Ushioni preservation group of the Maruho district) and Uwajima-shiyakusho ushioni hozonkai (the Ushioni preservation group of the Uwajima city office), collectively called Uwajima ushioni hozonkai (the Ushioni preservation group of Uwajima City), participate in Matsuri-in-Hawaii, a festival held in Honolulu on the first Friday, Saturday, and Sunday in June every year.
宇和島市とハワイ州ホノルルや愛媛県とハワイ州の友好姉妹都市の関係で毎年6月第1金・土・日にホノルル行われるまつりインハワイでは、丸穂牛鬼保存会と宇和島市役所牛鬼保存会の有志が宇和島牛鬼保存会として参加している。