Of course it would suck to go to one of these, get even more hyped on the school, and then get rejected in the end, but I'm not sure that's enough of a reason to avoid going entirely. The coordinator may say that not going won't hurt you, but I have to believe putting an actual person to the name is a good thing more often than not. At the very least I think it's a positive sign. They wouldn't invite you and pay for hosting you if they weren't thinking of accepting you.