Hadaka matsuri - はだか祭り
Each area of Japan has its own festival more or less famous, that marks the seasons and the year. In Tokyo there are many famous festival but that is not all. Planning to see a festival in the country side or away from Tokyo is always a good idea because the atmosphere is really great and the ceremonies are often impressive. Most festivals are related to Shinto and seasonal events in the area. So the calendar of festival all over Japan is quite busy!
Last year we finally went to see Hadaka matsuri, a festival held every year in Ohara, Chiba on September 23d and 24th, very near to our country house. The festival climax is on Ohara beach where all the mikoshi gather and enter the sea one after the other. It's hard to describe the atmosphere and the emotions, so I can only but recommend to go and check out for yourself!!!
PS: better enter the beach from the north and walk along the sea rather than the main entrance which is really crowded.