The custom of releasing water lanterns in Sanjiangkou began when Xi Shi entered Wu from Yue. According to legend, on the 15th day of the seventh lunar month, Xi Shi passed through Sanjiangkou when she entered Wu. When she went to Wu, she used a bamboo raft to change boats at Sanjiangkou. At the second watch, the clan leaders rang the gong to wake up the villagers and welcomed Xi Shi with lanterns and torches. When the goddess changed boats and went north, the villagers lit straw and threw it on the river. The burning piles of straw went with the boat as a gift to the goddess, and it became a custom. On this day every year, the villagers of Sanjiangkou folded lanterns and lit candles, put them on the water, and let them float. It is also said that it was the release of water lanterns in Sanjiangkou that scared off Wu Zixu's tide soldiers. The Sanjiangkou water lanterns gradually developed from the early straw burning to the current water lanterns, which are made of bamboo strips, pasted with new paper, supported by foam plastic, and placed with candles or vegetable oil wicks on top, which can be lit and discharged. Every night of the 15th day of the seventh lunar month, the villagers of Sanjiangkou will release water lanterns on the Puyang River. The custom has been practiced till now and has become one of the main festivals for villagers on both sides of the Puyang River and Sanjiangkou. In October 2010, it was included in the fourth batch of Shaoxing City's intangible cultural heritage list.