Thanks for the reply. I do know the local limits and I will abide by them.
But, what I am looking for is a concept of "how loud" the dance area should be, and how much quieter surrounding bar areas should be. Once I know that, I can design the system, speaker placement, and acoustical treatment around those numbers vis-a-vis local regulations.
I used to work for an acoustics consulting firm and I have a concept of how loud a large church or classical concert hall or hospital paging system should be, but I don't know those numbers for a dance club. Surely someone has a specific concept of this and would be kind enough to contribute.