The earning statements for nightclubs are confidential documents that can only be viewed by authorized persons. You can visit the offices responsible for governing the individual night clubs for further inquiries.
Privately owned companies do not need to release earning statements. If Miami has a specialized "Entertainment Tax" and an "Alcohol Tax" you might be able to submit a Freedom of Information Act request to Dade County and ask to see the amount collected from the venues. You will then have to calculate what was earned based on what was collected if you know the tax rate.