I've gotten emails asking me when Thrashers prospect camp is this year. As near as I can tell, it's July 7-13 at the IceForum. Yes it's open to the public.
If you can't wait that long, Nashville's gets underway (on-ice) on Thursday. The Rangers are underway too, but that one I think is closed.
The IceForum is very cold, so remember to bring a jacket. If you wear a t-shirt and shorts, you'll likely be very uncomfortable. Personally I bring a scarf, gloves and earmuffs, because there's no stopping by -- if I drive out there, I'm there for the duration.