journey of the gods to Izumo Grand Shrine
In Shinto belief, the gods travel to the Grand Shrine of Izumo in the tenth month of the lunar calendar, which is called 神無月 (month without gods) elsewhere and 神在月 (month with gods) in Izumo.
The tenth month of the old calendar is considered the time of the journey of the gods, and it is said that gods from all over Japan gather at Izumo Grand Shrine.
Compound of 神 (kami, 'god') + の (no, possessive particle) + 旅 (tabi, 'journey'). The term is specific to Shinto folklore.