Another one here where is depends on the event, who is hosting, why, where etc

If it is party where I am likely to bring a present, then chances are I wont bring a plate and would probably be miffed if requested, unless I know the person does really need a helping hand or just loves one of our dishes. BBQ's I will often offer to bring a salad or dessert, I will say though I am not a fan of BYO meat to a BBQ.

If something is more of a casual get together, especially when is tends to be more at the other person place than at our, then I definitely offer to bring a plate and some grog.