In Japan there is an original name of the month from January to December.
For example, This month October called “Kannatsuki”. Because Gods allover Japan have gatherings at “Izumo taisha Shrine” in Shimane Prefecture, to talk about the schedules or makes agreements for One year.
It has also been said that aside Izumo, this is the only time that there’s no-God but vice-versa in Izumo shrine, they called it month with-God.