I've just been taking a quick look around and it seems like entry is free
Definately might be worth going!
Still need definitive information though
I don't want to turn up and there be nobody else there at all LOL
Challengers are a step up from Futures, right? So I'm guessing they get a few more people there? I know they get some fairly well known players competing in Challenger tournaments becuase it's only one tier below ATP level.