Wear something you can sit in! I made the mistake one year of having way too much boning on my dress. By the end of the night I had bruised ribs.
It's a long day, so you need to have a hairstyle that will last the distance - and pack plenty of bobby pins.
Phone, lippie, some powder, bobby pins and bronzer.
I cut my toe open a week before the 2012 Logies, which meant I couldn't wear proper high heels.