Vieng market festival is launched on the annual 8th day of the first lunar month in Nam Truc and Vu Ban, Nam Dinh. Legend has it that Vieng market is linked somehow to the person who brought copper casting to the area, Nguyen Minh Khong, so people who go the market feel that they will get lucky if they buy something made of copper at Vieng market on this day.
The unique thing of Vieng market is that it is organized once a year in the 8th of first lunar month, however, on the night of 7th, the people from everywhere have chance to join in the market to seek for luck in Kim Thai, Vu Ban, Nam Dinh.
That is the moment of heavenly-earthly, positive-negative exchange. According to the popular belief, at the time, men and Gods could reach together and all the prayers could be perceived more clearly. Trade could at the time take place smoothly. The market-goers not only just enjoy the market atmosphere but also bring along the feeling toward Mother, praying for fortune and favourable nature, rich crops, happy family. They buy and sell just for aspiration at luck in the rest of the year.