Reisai: May 1 to 5.
Raiden Shrine, or Thunder Shrine, was established in 598 by Shotoku Taishi. This area has many thunder disasters and also the flooding problems. Therefore, people built this shrine to save thunder.
The current main building was constructed in 1835 and the upper shrine is constructed in 1868. They have great carving arts on the walls.
Hachiman Shrine is the oldest building in Gunma Prefecture. It was constructed in Muromachi period.