from this event... game idea:
create a social media site - allow postings, conversations, threads, etc.
Every quarter (or some other period), there is "reconning". You are placed into a complete stranger's account, and now you have to continue it for a week (or some other short period).
Whoever can maintain the quality of the account, in the direction as the original owner, wins a banana (or kumquat, something good but not expensive for anyone).
After reconning period, owner returns and judges. None-participation is default no-win.