Getting the most out of technical conference as a services provider?
My answer to Getting the most out of technical conference as a services provider? on Quora
Leaving flyers out if you are not a sponsor will annoy both the event organiser and the other sponsors, and may give a bad impression to other attendees as well.
I suggest just talking to as many people as possible, and building relationships that way. You should see a much higher conversion rate from that than from leaving fliers lying around.