I am in a similar position: I have been invited to two recruitment weekends (expenses paid for both). I was definitely accepted to one of them. For the other one (my top choice), I was contacted by my POI very early in the application process and everything indicated that I would be accepted - but I haven't been officially. My POI made it sound like the recruitment weekend was basically to do just that, recruit me - show me the campus, the lab, meet students, etc. I think it just depends on the school. I would say, however, that it seems like there is a reason why schools call it a "recruitment" versus "interview" day/weekend. From what I've heard, recruitment means you are in or will likely be, and interview means, obviously, that you are being considered and they are still making cuts. It also can't be a bad sign that they are paying for expenses. I haven't had any "interview" visits, so I don't know if those are often paid for by the department. Anyway, I hope that helps.