Buriram Walking Street takes place every Saturday and Sunday evening, on Rom Buri Road (see map below). For this big night market the street becomes pedestrian for a few hours. There you will mostly find stalls selling all kinds of dishes and small snacks, a good opportunity to discover the local thai food and have dinner for cheap. Thai local night markets, especially in provincial towns with a few tourists are very popular with locals and have a very friendly atmosphere.
There is also a stage with live music. Note that there is also a night market a few streets away which takes places daily but has much less charm.