Inside the hall entrances, there will be a list of member numbers who have been randomly selected as winners of a door prize. No idea what the prizes are, as I've never won. Take a look - maybe you'll be lucky.
I won once. I got an O/HO scale tree. One tree. The prizes consist of donated items and can be seen in the Silver Hall at the end of the registration area near the room divider and right before the convention merchandise table. There is rarely anything exciting, and if there is, it will get claimed early. It is pick-of-table, so check early.
Andy