Baisakhi : Several Indian festivals coincide with the harvest time and Baisakhi is one of them. Baisakhi is celebrated by the people of Punjab with vigor and joy. It is celebrated by different names and with different rituals almost all over India, when the Rabi crop is ready for harvesting. Baisakhi is also the day when the tenth Guru of the Sikhs, Guru Gobind Singh, founded the Khalsa Panth over three hundred years ago. The Vaishakha period of April and May is filled with festivals of fun, frolic and merry-making and Baisakhi, derived from the word Vaishakh, falls in this auspicious period. Based on the Indian solar calendar, this festival falls on April 13 every year and on April 14 once every 36 years. Other festivals celebrating the harvest are Bihu in Assam, Pongal in South India.