Kanda-Matsuri is a festival usually celebrated every two years since in about 1600 at Kanda-Myoujin(神田明神) in Chiyoda Tokyo. The Three Great Festivals of EDO are “Kanda Matsuri(神田祭)”, “Sanja Matsuri(三社祭)” and “Sannou Matsuri(山王祭)“.
Although “Kanda Matsuri(神田祭)” and “Sannou Matsuri(山王祭)” are the long-accepted theory, there is an another theory that the third festival is “Fukagawa-Matsuri(深川祭)” or Nezu-Shrine-Reitaisai(根津神社例大祭) instead of “Sanja Matsuri(三社祭)”.

Source of a Quote Wikipedia Kanda-Matsuri(神田祭)
Miya-Mikoshi Miyairi(宮神輿宮入/江戸村のとくぞう)

The festival is filled with excitement.
Would you like to join that?

Any way, the three great festivals of Japan are “Kanda Matsuri(神田祭) in Tokyo” “Gion Matsuri(祇園祭) in Kyoto” “Tenjin-sai(天神祭) in Osaka”.

Source of a Quote Wikipedia Kanda-Myoujin(神田明神)