It is said that the stars Vega and Altair, separated lovers, can meet each other across the Milky Way only once a year, on this day.
To celebrate this special day, children set up bamboo branches hung with paper strips on which poems and wishes are written.
Eisai is also associated with tea and wrote a book on its properties.
Big city streets and roads get blocked off for the mass pedestrian flow.
Its even difficult for bikers to get through the crowd.
July 15 - 17 Gion Matsuri is one of the top 3 biggest Festivals celebrated in Japan.
It is celebrated to keep away bad omens such as disease and natural disasters.