There are plenty exhibitions of traditional dolls throughout Japan, but Katsuura Hina Matsuri in Chiba is by far the biggest Hina dolls display in Japan.
The Doll’s Festival is celebrated on March 3 and its origin dates back to the Heian period (794-1185). It was thought that the dolls were able to absorb the misfortune of men. At that time, the lords were offering dolls representing little girls to the imperial family, especially the princesses, to free them from their misfortunes. It was a  Shinto ritual purification.
Now democratized, all Japanese girls put on their best display dolls representing the Emperor, Empress and the court, and invite their friends to admire them, drinking tea and eating cakes. For the occasion, they wear a long-sleeved kimono and receive gifts from their parents and their friends. During the day, they go with their parents to the local shrine to pray the gods.

Access: https://goo.gl/ijy894

This service, proposed by “Maricar”, allow you to rent karts and race through the streets of Tokyo. Every kart is equipped with mirrors, a bumper and a small flag so you do not get rolled over by the first truck. You are allowed to ride on the road and anyone having a Japanese or international driver’s license can drive these karts. Wearing a helmet is not required, you can choose a costume, rent a Go-pro to record your trip and it is a very nice way to explore Tokyo. Karts are available for rent at a price of ¥2.700 per hour or ¥10.800 for the whole day.

More info: https://kart.st/