I hav also been stuck on 12 of 15 for the last couple of hours. I have been playing Dragon Story daily since the game began and have over 130 friends but can't get 15 invites. That is not right! Why should this event have to count on neighbors to complete a chapter? Especially on the last day. This gives us no time to gather required responses. If there was a way to determine neighbors that no longer play, it would be a big help. Maybe the developers would be willing to add a 'days since accessed' timer to the neighbor list so that we could remove inactive accounts easier. I really enjoy the game and hate that I may not complete this event.