This event is in progress: “In Tsuetate Onsen, the Koinobori (carp streamer) Festival is held from April to the first week of May. About 3,500 koinobori swim above the Tsuetate River to the flow of a refreshing spring breeze. This Koinobori Festival has been celebrated as a seasonal tradition in Oguni-machi for over 30 years.”
Web page with Google map: http://kumanago.jp/en/events/detail/430000003646.html
Photo: http://kumanago.jp/thumb.php?path=./photo/430000003646/1332750820.jpg&mw=346&mh=246