That's a neat idea!
Are you guys going to have Pete tweet it, too? I'll be curious to hear the final odds on getting a ticket. :)
We've allocated an equal amount of tickets for previous attendees and for first-time attendees, so that both groups will have a fair chance of attending.
That's cool! Makes it a good incentive to re-attend, as your odds will be much better (given, I'm guessing, there will be a lot more new people wanting to attend than the number who have attended before, though I could be wrong). That should give a good mix of past attendees and new people.