New question was asked and added that I'll answer more detailed here:
"What if we don't get 20 sign-ups?" - Any number above 10 is fine. Preferably divisible by 2. If needed I can make up the last spot.
there has been a lottery drawing going on for years...buy X amount of tickets at $2 each and see if you hit.. drawings are 2x a week. I think you can buy up to 50 tickets at a time through the lottery page. If you have a personal assistant you can have him set to buy up to 5000 each drawing.