you can get a wristband any time you want. they give them out prior to doors opening. beginning at 5 they ask you to line up by wristband to keep the line order in control. Then they start letting people in to swipe their card and get an official wristband for north or south side of the floor.
once all wrist banded people in line through the door, you can literally walk up and go in no GA line wristband is even needed. Its only prior to doors opening that you need it.
not random. when the doors open they start at the beginning of the line.
be there at 4 to "prepare the GA line, ge