Dentyne Pure Mint/Melon - With all the talking you'll have to do at BEA, the last thing you want to worry about is your breath! This is my favorite gum because it doesn't just mask that bad taste in your mouth, it gets rid of it!
Tote bag! While I don't have this specific tote (though isn't it cute??), I'll definitely have a tote bag folded up and ready to use. You will definitely get totes at BEA (possibly more totes than books), but they can be scarce that first day on the floor.