An annual autumn festival held to celebrate the beautiful changing leaves of the area. The well-known Momiji-Tunnel is a highlight, with evening illuminations from sunset until 10pm. There will be food stalls, performances and local specialties to try, with crowds expected for weekends. You can see a map of the festival (in Japanese) here.
The nearest bus stop os the Ichika Kubota Art Museum stop, which is on the loop routes and local bus services.