The Gregorian calendar is used alongside the national Indian calendar. Like the solar calendar, the Indian calendar has tweleve months. There used to be dozens and dozens of Indian calendars all centered around each region’s religious festivals. Luckily, now there is only one standard Indian calendar. I have the Indian month which corresponds to a Gregorian month, so that you have some idea of when the Indian months take place.
Chaitra (चैत्र) starts around March 21
Vaisakha (वैशाख) starts April 21
Jyeshta (ज्येष्ठ) May 22
Aashaadha (आषाढ) June 22
Shraavana (श्रावण) July 23
Bhadrapada (भाद्रपद) August 23
Ashwin (अश्विन्) September 23
Kartik (कार्तिक) October 23
Margashirsha (मार्गशीर्ष) November 22
Pausha (पौष) December 22
Magh (माघ) Janurary 21
Phalguna (फाल्गुन) February 20

Rath Yatra is a famous celebration held every summer in India. Rath (रथ) means chariot and Yatra (यात्रा) means procession. Rath Yatra is celebrated in the city of Puri in the state of Orissa. On Rath Yatra, all three deities are paraded throughout the city for Darshan (
The three deities are wheeled on a wooden cart. The carts are made by skilled craftsman who come from priviledged craftsman families. The sewers of the fabric take painstaking care to make sure everything is made according to religious standards. The chariots are designated by different colors. Usually the white cart stands for Balaraama (
Usually the deities are held in the interior of the temple. Only people of Indian descent can enter the temple and view the deities. However, on the day of the festival, everyone has a chance to view the deities. The festival is a commemoration of the day Jagannath returned to his hometown. The day of the festival is normally a happy and exciting day for the crowds that line up to see the deities. However, in the past, there has been instances where it has turned dangerous and bloody. People have been known to be trampled under the carts and children have been known to lose their parents amist the noise and crowdedness.