They announce 1 hour before the player starts signing. For example, at 1:00 PM, they'll show who is signing at 2:00 PM and where. Everyone huddles around the area where the TV's are showing all this, and once announced, mobs of people will run to the big names. You hope to be one of the first 250 there, and then you wait an hour+. You'll be in that line while they announce the 3:00 signers at 2:00 PM, and probably won't have a shot at any of them (if they're bigger names), so you kinda have to be selective. I hope this helps and whatever I just typed wasn't too confusing.