lumpini stadium and ratcha something (dont know how to spell it sorry), just buy a ticket when u get there and dont bother paying for the higher priced tickets
did you do a search Deano? i did out of curiosity and found 5 threads which relate to your question. there is a lot of good info and one of the members posted a link which was very helpful.
just click search and type in 'thai boxing',it really is that easy. happy reading..........