Hello and thank you for allowing me the opportunity to assist you.
Question: “Am I able to file small claim suit against them?”
Answer: It sounds like you have a couple of issues here.
With regard to the first issue about the loss of sales, did you have a contract that stipulated that you’d be placed in a high visibility area? Do you have a written guarantee about sales? If you do, then you may have a decent case against he promoter of the event for loss of revenue due to breach of contract. If you have no such contract, then I’m afraid you have no case since you can’t establish that the promoter owed you a duty to place you in a high visibility area.
With regard to your second issues about the shuttle bus, you may have a case for negligence, but you'll need to prove that you fell because the bus should have had lights and didn't. You’ll need to sue where the accident occurred, or where the promoter lives (they may be in the same jurisdiction). Unfortunately, you won’t be able to sue in Brooklyn. Also, you'll only be able to win an amount that equals your out of pocket expenses, plus pain and suffering. If you didn't have any medical bills, then your judgment may be small. Punitive damages, which can be quite large, are only awarded in cases where the defendant purposely caused injury or totally disregarded the plaintiff's safety (this is called "gross negligence"). It sounds like ordinary negligence in your case.
Have I satisfactorily addressed your concerns? If not, then please feel free to ask for clarification.
DISCLAIMER: Please be aware that only an attorney licensed in your state is authorized to advise you in legal matters, and that the limitations of this setting may prevent your legal issues from being thoroughly addressed. Accordingly, please understand that (1) by answering your question(s) I am not acting as your attorney, (2) my answer(s) should be construed as general information only, and (3) our discussion is not an adequate substitute for an in-person consultation with an attorney.