If you think fireworks festivals in Japan are only typical of the summer, then you should visit Nagano around the end of November, when the weather is already getting colder, to watch Nagano Ebisukō Fireworks Festival, one of the major fireworks festival in Japan.
The festival is held annually on November 23rd and is located on the banks of the Saigawa River in central Nagano. If you have the chance, do make a visit and enjoy a superb performance.