Late post. The family went to this event at the botanical garden last night and got home late. There were long walks and my lumbar spine feels like it's rusted out these days so no editing until this morning.
The event is called Toro Nagashi. There is a mid-August Buddhist festival in Japan called Obon that honors ancestors. Toro Nagashi occurs at the end when ancestors return to the spirit world. A flame representing them is transferred to a lantern, toro, along with notes of well-wishes and memories, and set afloat.
Not the best photo but they didn't allow tripods. You can get a bit of the feel.