A rather new market located near Chatuchak, opening 7pm to very late (it was still going strong yesterday at midnight) saturday and sunday.
Half of the market is flea market with some unusual items for sale, lots of vintage cars and motorbikes on display. Rest of the market is clothe and gadgets.
Visitors are 90% young Thai, very few foreigners or Thai older than 30 in this market...so prices are low and lots of eye candy around...nice place! Also lots of bars and food avalaible.
To get there take MRT to kamphaengphet station, take exit 1 and follow the crowd