It is a theory that the origin was "Okuwa Festival" held on March 20, 1866 (表記の変更) as the 100th anniversary of Okuwa-sha Shrine located in current Iwatsu, Okazaki City.
慶応2年2月4日、現岡崎市岩津の御鍬社百年祭「御鍬祭り」が、ええじゃないか騒動の発端とする説。