This national celebration, also called the Horse Racing Festival, takes place at
the Tundikhel parade grounds, the wide green just east of old Kathmandu.
says the event originated as a celebration of a battle in which the people of
Kathmandu conquered a bothersome demon.
The spirit of the demon is said to be
imprisoned beneath the Tundikhel, and it is believed that the annual tramping of
horses' hooves keeps the demon subdued for another year.