It depends on what has gone on previously in the conversation. For example, wouldn’t see is contingent on the assumed condition if you went into the hall on Friday nights. So it might be a suitable response if someone had said I’ve been told that I wouldn’t see anyone if went into the hall on Friday night. Why’s that?
Don’t see assumes that the previous speaker has actually been in the hall several times on a Friday night and hasn’t seen anyone there. It might follow the question How come I don’t see anyone in the hall on Friday nights?