Time Out says
Yasukuni Shrine's annual Mitama Matsuri is one of Tokyo's biggest Obon festivals. First held in 1947, the festival is best known for the 30,000 lanterns that light the way to the shrine each evening – so don't forget your camera. This year, the lanterns will be illuminated from 5pm to 8pm daily until July 18.
While the lantern display is going ahead as usual, the stalls and dedicated celebrations have been cancelled as a coronavirus safety measure. You can also check the crowd situation at the festival via Yasukuni Shrine's live-stream on YouTube.