The Tokyo Motor Show happens once every two years.
You can see all the new achievements in Japanese technology in terms of brand new vehicles and concept cars. There's many different offerings from all the well-known Japanese companies as well as trucks from Volvo and a variety of motorcycles and even hands-free Segway type rides.
They also have engines on display, as well as see-through cars and different systems of the cars shown without the vehicle around them. It's a very cool show not to be missed.