I've been to 3 Nationals, 2 in Chicago and 1 in Cleveland.
I only had time to spend one day, so as others have said, take a notebook, and jot down the table number where you saw something you might want, or you will have great difficulty finding it again.
Take something to put your cards in like a satchel or camera bag.
If I could I'd try to spend 2 days.
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