I travel to Chaiyaphum quite a lot as we have a farm 104km away in Thep Sathit. I usually make any excuse to go to the HomePro or Makro or Big C - luxury compared to Thep Sathit!
Try as I might find it (and I can sniff out a naughty Bar from 5km :ph34r:) Chaiyaphum must have a very subdued night life because I've not yet cracked it. Apart from the usual Tawandang (thai Beer hall) there doesn't seem to be a "bar street" as many would know it.
If you do find it however - please let me know! <_<