last day of the Bon festival
Refers specifically to July 20 (in most regions) as the final day of the Bon festival period. The term is relatively specialized and may not be widely known outside of traditional or regional contexts.
On the last day of the Bon festival, a ceremony to send off the ancestors' spirits is held.
In some regions, the custom of observing the last day of the Bon festival remains especially important.
Formed from 裏 “later or concluding part” and 盆 “Bon festival,” denoting the closing day or concluding phase of Bon.