Why does the whole country travel home in mid-August, and what are those dances in the parks?
Around August 13–16, highways jam and bullet trains sell out as millions return to their hometowns. Families clean graves, light welcome fires, and set out cucumber 'horses' and eggplant 'cows'. In the evenings, neighborhoods gather in yukata to dance bon odori in a circle around a drum tower.
Obon is the period when ancestors' spirits are believed to return home for a few days. Families gather to welcome them and send them off — the cucumber horse carries them back quickly, the eggplant cow returns them slowly — so Obon doubles as Japan's great homecoming.
Why — five layers
In Japanese ancestor veneration, the dead remain members of the family who are cared for across generations. Obon — rooted in the Buddhist Ullambana rite — is the annual appointment for that care.
Because the spirits return to the family home, the living must too — Obon quietly obligates urban migrants to go back to where the family grave is, refreshing hometown ties once a year.
Obon is not an official national holiday, but school summer breaks and standardized company shutdowns (obon-yasumi) synchronize the entire country into the same few days — which is exactly why the trains are full.
International view
Mexico's Día de Muertos is the closest cousin — the dead return and are celebrated. China's Ghost Festival shares the Buddhist root. Distinct in Japan is the synchronized national homecoming and the community circle dance anyone can join.
But not always
The dates aren't uniform — much of Tokyo observes Obon in July, and Okinawa follows the lunar calendar. And for plenty of younger people it is, in practice, simply the summer holiday.
What to do
Avoid long-distance travel around August 11–16 unless you've booked far ahead. Do join a local bon odori — the steps repeat every few bars precisely so that anyone, including you, can fall in by copying the person ahead.
Sources
- temple explanations of Ullambana/Obon
- annual coverage of Obon travel peaks