This is not a place to visit but I took the habit of indicating the night markets in Thailand in each city because as for me they are always nice places to go in the evening for dinner. Their booths allow you to discover the local Thai Street Food and in less touristy cities like Loei, you can really feel the life and the local atmosphere. The counterpart is that the menus are exclusively in Thai but we always manage to order food.
Loei's night market is quite small and lies on the edge of Kut Pong Pond and close to Kut Pong Park.