Sweet tamarind is grown mostly in Phetchabun. Sweet Tamarind Fair is thus organised in Phetchabun to celebrate the harvest of this fruit. This day is also called Phetchabun's Agricultural Day. During the festival, farmers bring their sweet tamarind to sell at reasonable price at Phetchabun's provincial athletic field where contests of sweet tamarind and other crops are held. Besides this, there are other agricultural exhibitions and entertainment organised during the event.