If it is being held in a Function Room I don't see why you will have any problem in your no smoking request.How could anyone seriously complain about a fresh atmos.

As someone pointed out it is a concert venue, albeit on a smaller scale, and in most concert venues not smoking is the norm.

I belong to the breed of smokers who annoy other smokers....can have one a week or one a month, but would not dream of lighting up anywhere that has a roof, I find that a good rule of thumb.