I believe that a friend looked into dueling in Massachusetts a few years back. Apparently it is still legal. You just need to be in a designated public space (the Boston Common) and have the Governor present. I could be mis-remembering. Sounds like Stand Your Ground would just eliminate the requirment of having the Governor present. You might also want to make sure that the space you used was safe enough to prevent any accidents with any by-standers or the like.