Nope. Businesses that are open to the general public can only refuse service for non-arbitrary reasons, and they are open to legal action if they are inconsistent. For example, you can refuse to let more than 50 people into your building at one time for reasons having to do with fire safety (even if the fire code allows more), and you can change the policy to a maximum of 45 or 55 based on your observations of customer behavior. But if you randomly decide on the maximum occupancy you will allow each day, those who get turned away when your number is arbitrarily low will have a case against you regardless of whether they are part of any protected class.