A TripAdviser, Baba.

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I really recommend you to go Nagaoka on August 2nd or 3rd, because there is an amazing fireworks event called Nagaoka Fireworks Festival which is held in Shinano Riverside. You can go there 20 minutes walk from JR Nagaoka Sta. Last year, Nagaoka Fireworks Festival 2009, more than 800,000 people came to enjoy about 20,000 beautiful fireworks in 2 days. Each firework is using funds donated by private citizens and companies, and they put a lot of feelings into a firework. So, that is not only beautiful, but also impressive. It’s hard to describe by words alone how good it is, so please witness with your own eyes.
Although the event will be starting at 7:30pm, around the 5pm, the place will be already full. So, please remember go earlier on to book your places, and you will be able to sit down and enjoy the festival. Have a nice summer vacation with wonderful Japanese fireworks!