I have a suggestion. Try contacting Todd Greene with Track Scan about the Vibras Five.One gaming headsets. I know he’s worked several events and helped provided headsets for large and small events. They’re a fairly local company to boot (based out of Mooresville, NC). I met him a couple years ago at the Carolina Gaming Summit where they had headsets for multiple tournaments. Wouldn’t hurt to contact them and get them as a sponsor.
http://www.track-scan.com/2/vibras.html
I plan on going to CGS again this coming February, so if he or Vibras/Track Scan is there again I can definitely talk to them about it as well if need be.