ok, I'm ready to say yes to this. What I am going to ask you to do is:
Install the Swing wallet
Post two ZEN addresses here. One that is transparent, and one that is shielded.
I will send you 1 ZEN each for 10 users on the transparent address, and will send you a message using the memo in the shielded address.
If you can send me a memo back replying to my memo using the shielded address with a second transparent address and how many users there are (10-15 you said), I will send you the 60 ZEN for tournament winners to that address.
All I would like you to do during the tournament is help the 10-15 people to install and use the swing wallet, send them each some ZEN on a transparent address, and some zen and a message on a shielded address. You can do that however you want.
I'll track the activity using the block explorer.
Do what I just asked above, and I'll send you the 40 ZEN for getting it done.
How does that sound?