I received the following information in an e-mail from the Kumamoto City International Foundation:
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■Nandaimon Spring Festival The baby sumo ring debut ceremony and scattering rice cakes will be held, and you can experience rare tea ceremony. Day and Time: Wed.,29th. Apr. 10:00~16:00 Place: Renge-in Tanjyo-ji Temple (Tamana City) Admission fee: free Access: Kyushu Shinkansen (bullet train) from Kumamoto Station to Shin-Tamana Station (about 15 minutes) It takes about 10 minutes from the station by car. Or it takes about 10 mitutes from JR Tamana Station by car. For more information: Renge-in Tanjyo-ji Temple (TEL: 0968-72-3300) *Japanese only Website: http://www.rengein.jp/
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Japanese explanation and the photo you see on this post can be found here: