Chance of getting tickets at Club day of a show?

Hey,
Just curious does anyone know whether additional tickets ever get dropped the day of the show for concerts at 9:30 Club (like they do at other places)? I only ask because my friend would love to go with me to Keane tomorrow, I just got lucky and got a single ticket after it sold out.
Also does anyone ever sell tickets outside the show? Just curious since I am a 9:30 Club newbie and wanted to know what the chances of my friend getting a ticket tomorrow would be, obviously don't want her to come to D.C. for nothing. Thanks and hope to see lots of you at Keane tomorrow night!!
This happens very rare, almost never. It will not happen tonight.

Sometimes people do sell extra tickets out front.