I just came across this photo:
http://windylife.deviantart.com/art/Lantern-Fes-at-Yamaga-city-154785581
The festival takes place in February. Here's a link to a Japanese page about the event:
http://www.y-kankoukyoukai.com/event/tourouroman.html
Lantern Fes at Yamaga city by *WindyLife on deviantART
Lantern Fes at Yamaga city I took a short trip to Kumamoto, Kyushu in Japan. Kumamoto castle, Suizenji Park, Ueki onsen, Aso mountains, Yamaga cities......