Note sure I've heard the term Peace Bond here. I did use the term Good Behaviour Bond a few times, which is where a conviction may be recorded but the judge will set a period of good behaviour rather than incarcerate someone.
As for barbecue, BBQ, barbie, I guess they all cover the same type of event, usually steaks, sausages, chops etc ... though other foods (prawns, chickens etc) may sometimes be cooked up, depending on family tastes. No real distinction between regions in the use of any of those terms... at least as far as I'm aware.
Hope that is of some help.
MP