Board Thread:Naruto Discussions/@comment-3568954-20140813114759/@comment-25300347-20140813150036

Between the 13th and 15th Japan celebrates a holiday called Obon I'm not sure if this what you were referring to Seelen but not all regions in Japan celebrate this in August. Some do, but the day is celebrated in the 7th month of the year, but since the 7th month of the year roughly coincides with August rather than July according to the formerly used lunar calendar, Obon is still observed in mid August in many regions of Japan, while it is observed in mid July in other regions.