This magnificent fair is held every year at Vautha, where two rivers, the Sabarmati and the Vatrak meet. Like most fair sites in India, this also has both mythological and current religious associations.

The Vautha Mela site is 3 square miles in area. Legends hold that Kartik Swami or Kartikeya, the son of Lord Shiva, visited the site. This is why the fair is held during Kartika Purnima, the full moon night of the month of Kartik, corresponding to November. The site, also known as Saptasangam, is at the confluence of seven rivers. The most important Shiva temple here is the temple of Siddhanath.
What is most significant about this fair is that it is the only major animal trading fair in Gujarat and is on par with the famous camel fair at Pushkar, Rajasthan. However the only animals traded here are donkeys. About 4,000 donkeys are brought every year for sale, usually by Vanjara (gypsy) traders.

The pilgrims who visit Vautha during the fair are from several communities and include farmers, labourers and people belonging to several castes.

The Shamlaji Melo, also called the Kartik Purnima fair is held in the month of November every year and lasts for about two weeks. It is attended by almost two hundred thousand people from adjoining districts and even from Rajasthan.

Devotees belonging to various castes and communities including the Garasias and Bhils throng this festival. These pilgrims come in groups, singing devotional songs and carry religious banners to have a darshan (worship)of the deity at the Shamlaji Temple.

The Shamlaji Temple is a renowned Vaishnav Shrine and the deity housed here is known by various names included Gadadhar (bearer of the mace) and Shaksi Gopal. The fair is also popular with the tribal people of the area, particularly the Bhils, who revere Shamlaji, the deity they refer to as 'Kalio Bavji', the dark divinity. The temple is of great archaeological significance as it was built in the 11th century. Apart from a darshan of the deity in the temple, the pilgrims consider a bath in the river Meshwo essential.