kubo wrote
Obon Feast
Next, let us look at the Obon feast. In Japan they have an event called Obon on July 15 or August 15. In the time they used the
lunar calendar it was held on the 15th day of the 7th month.
Today Obon is regarded as one of the events of Buddhism, but since the time long before Buddhism was imported to Japan, there had been a feast called Tama-matsuri which was the original of Obon. When Buddhism was imported to Japan, this Tama-matsuri was took in the events of Buddhism and became Obon. In ancient Israel on the 15th day of the 7th month was a big feast called the Feast of Booths (harvest feast, Vayikra 23:39).
Today the Japanese use the solar calendar and in many cases they now hold the Obon feast on the 15th day of the 8th month. Strangely this was the day when the harvest feast was held in the northern kingdom of Israel of the Ten Tribes. The Bible records that Jeroboam, the king of the northern kingdom, ordained a feast "on the 15th day of the 8th month" like the feast which was in the southern kingdom of Judah (Melachim I 12:32).
It was an Israeli tradition since ancient times to have the harvest feast on the 15th day of the 7th month, but King Jeroboam rejected this tradition and ordained a new day for the harvest feast on the 15th day of the 8th month.
In Israel, the Feast of Unleavened Bread (New Year) and the Feast of Booths (harvest feast) on the 15th day of the 7th month (or 8th month) were the most magnificent events throughout a year. Similar to this, the Japanese have been performing magnificent feasts at the same times as these. In Japan today, the 15th day of the 8th month is also the memorial day of the end of the last war.
http://www.moshiach.com/features/tribes/japan2.php