I might be wrong about this, but I think the Palladium recently established a policy in which once you enter the venue, you may not temporarily leave to have a smoke or whatever. I remember a huge fuss about it at the NE Metalfest.
If I remember correctly it was you couldn't leave after 6pm or sometime around there. I was able to leave and get back in no problem earlier in the day.
Anyway, I will be there. I have no real problem with the Palladium. Been to a good amount of shows there plus the NE Metalfest (and that was awesome minus the hardcore). I'm excited.