Hadaka Matsuri
The origins of Hadaka Matsuri date back 500 years when worshippers competed to receive paper talismans called Go-o thrown by the priest. These paper talismans were tokens of the completion of New Year ascetic training by the priests. As those people receiving these paper talismans had good things happen to them, the number of people requesting them increased year by year. However, as paper was easily torn, the talismans were changed to the wooden ofuda that we know today.
Naoi-shinji, also known as "Hadaka Matsuri (naked festival)", started in the year 767 AD, the Nara Period. This right was founded on the fact that the governor of Owari Province (presently Aichi Pref.) visited the Owari Shosha Shrine ( Konomiya shrine ) to drive away evil spirits and calamities, because Emperor Shotoku ordered all the kokubun-ji* to offer invocations to dispel plagues.
It is said that the form of the festival, a struggle to touch the Naoinin or Shin-otoko (man of god), is reminiscent of the struggle in old times between the assemblage of lower-ranking shinto priests called shanin and contributors tried to catch and set up a man for naoinin (shin-otoko), an unlucky poor man, who was unwilling to take the role.
Read more about this topic: Japanese Festivals