Held every Friday, Saturday and Sunday, Hanoi Weekend Night Market is a busy, bustling gathering of roadside stalls and local food vendors that brings huge crowds of locals and tourists. It runs through the Old Quarter district from 19:00 onwards, starting from Hang Dao Street and running north to the edge of Dong Xuan Market.
Pedestrian streets and historical sites within the area are illuminated with decorative lights, making this a popular spot for travelling photographers. Shopping-wise, the fashion items on sale won’t turn many heads as you will find the usual array of inexpensive t-shirts, handicrafts, accessories, shoes, sunglasses and souvenirs at Hanoi Weekend Night Market. However, the overall environment is very lively and bargaining is a way of life here - a good start is to offer about 75 per cent off the opening price.
http://www.vietnam-guide.com/hanoi/shopping/hanoi-weekend-night-market.htm