1.
returning home for the Obon festival; going back to one's hometown during Obon
The custom of returning to one's hometown during the Obon period (mid-August) to visit family and honor ancestors. One of the peak travel periods in Japan alongside New Year and Golden Week.
Usage
Obon (mid-August, typically August 13-16) is one of Japan's most important holiday periods. Many people return to their hometowns to visit family graves and spend time with relatives. This causes massive traffic jams and crowded transportation, similar to 正月帰省 (New Year homecoming).