It is random.  Just felt like hosting an event that will help players explore and see the spawn town.  As for the event itself, it will work much like the last time I hosted it.  Clues will be given at various locations around noobstown.  Once you get to the end of the quest line,  you'll have to use those clues to earn your treasure.  Just something that's meant to be fun that everyone can win and get a neat little trophy while learning a bit more about where things are in the spawn town.