Bon Festival of the lunar calendar
Refers to the Obon festival observed according to the lunar calendar, typically in August in many regions, as opposed to the solar-calendar Obon in July.
In Okinawa, ceremonies to welcome ancestral spirits are held during the lunar Bon Festival.
The timing of the lunar Bon Festival varies by region.
Compound of 旧 (old/former) and 盆 (Bon Festival), literally 'old Bon', referring to the traditional lunar calendar observance.