It is celebrated for five days from the Kartik ekadashi to Kartik Poornima, the full moon day (the 15th) of Kartik (October–November) in Hindu calendar.
The full moon day is the main day and the day, according to legend, when the Hindu god Brahma sprung up the Pushkar Lake, thus numerous people swim in its sacred waters.
In the photo above, Indian camel traders arrive with their livestock for the annual Pushkar fair in Pushkar, Rajasthan state, India, Monday, Nov. 19, 2012. The weeklong cattle fair attracts a large number of tourists from different parts of the world.