Not sure of a code at the moment, but free passes usually pop up at the last minute. I know some networks get the codes, so you might want to talk to some network reps. For ASE, a free pass was posted in June, so there might be one posted in the next month or so.
I got a full pass for free through a network for ASE, and I have some friends who didn't have that opportunity, but got free exhibit hall passes and came along.