Tonight is the Obon Festival in Japan
Commemorating one's ancestors
Obon (お盆) is an annual Buddhist event for commemorating one's ancestors. It is believed that each year during obon, the ancestors' spirits return to this world in order to visit their relatives.
Floating lanterns (toro nagashi)
In recent years, floating lanterns (toro nagashi) have gained in popularity. The beautiful lanterns float down a river that runs to the sea to symbolically send their ancestors’ spirits into the sky, although customs vary from region to region.
Source: https://www.jrailpass.com/blog/obon-festival-in-japan
Obon Festival is an annual Japanese ritual observed from the 13th to the 15th of the seventh lunar month. This year, the holiday will be celebrated from August 13 to 15. It can also be held from July 13 to 15, depending on the calendar used. Obon is similar to Mexico’s Day of the Dead and China’s Hungry Ghost Festival. During the three-day festivities, the Japanese welcome the spirits of their dead ancestors and rekindle their connections. Although it’s a festival cherishing death, Obon is more fun than creepy. People engage in fun activities, folk dance, and music events. They visit and clean the graves of the ancestors, light ‘chochin’ lanterns, and eat traditional dishes.