You are working with your local fire marshal to ensure that you have the proper sprinklers in case of fire, as well as smoke detectors and carbon-monoxide detectors. You also have the needed fire safety exits in the event of an emergency. Your local marshal is known for being hard on businesses like yours, and for good reason, this type of entertainment comes with inherent risks. He was pleasantly surprised with your setup and gave you top marks for safety. Your mother would be proud.
One of the major safety measures you have in place is proper ventilation. You did satisfy the industry standard for ventilation, as well as the standards set about by your city, but you also went above and beyond. You want to ensure with all of the chemicals that are involved in a night club environment as well as the inevitable fumes from smoke that go along with a party-type venue, that you have the best in ventilation.
Not only have you made your mother happy and the fire marshal happy but you will make your grandmother happy when you install the product that will satisfy the stairs' anti-slip requirement in your safety plan. It can get messy with spilled drinks, gobs of glitter, and spray foam, so you want to be sure that your customers are safe as they traverse the stairs around the club.