Some of the Animal Gear in the past has sold out on the first day (Friday), and some within the first few hours.... Historically, shirts like "Shut The Fuck Up And Train" are gone by Friday. Limited edition Animal Gear can disappear before Saturday as well. Same with the commemorative "The Cage" t-shirt that's given away for free every year....
So, if you are going, think about getting there Friday.... That is all.