The Pho Cao ethnic fair in Dong Van does not have a fixed date schedule, a very unique market because no one knows exactly the next time it will take place. It is a busy trading hub for Han, Dzao, Giay, Tay, H'mong ethnic people and others. Many people have to depart from their villages in the early morning or even one day in advance to reach the market in time. Up to 17 ethnic minority gather in Pho Cao market and especially, few tourists have ever visited this place.