First: I think that it is a great idea, I would like to run it at our local meetups. Maybe even with small amounts of cash incentives.
Second: (Off-topic) I am native russian speaker. I was dumbfounded by spelling 'dilemna' and immediately googled it. If you are interested here is interesting review of the problem: http://www.dilemna.info/index.php I am quite shocked to discover that there is community with millions of people worldwide, who spell word 'dilemma' with an 'n'...
We'll be meeting in the Kogod Courtyard of the National Portrait Gallery for our second Prisoner's Dilemna tournament. We'll play several different versions of iterated and one-shot games; feel free to suggest your own formats. There will be prizes (baked goods).