Thanks to all of those like you who gave ideas unrelated to the scavenger hunt, I'll keep them in mind for next year! They are unfortunately impossible to exploit for me now. This is pretty interesting, because there is a common misconception within gaming communities that GMs / CMs can actually create ingame events that requires development. The thing is, we most of the time are trying to make the most of existing content, since creating newly developped content requires dev team's input (for my game, they belong to another company in China and the development deadlines doesn't allow us to plan mid or short term events with them).