What year was the Kodokan school and dojo opened ?
In May or June 1882 , Kanō started the Kodokan dojo with twelve mats , in space belonging to the , a Buddhist temple in what was then the Shitaya ward of Tokyo ( now the Higashi Ueno district of Taitō ward ) , with Iikubo attending the dōjō three days a week to help teach .