2x Chicago mastery starts now!

Here's another mastery event, this one for double mastery on Chicago jobs for the next 5 days, through 12/27 Pacific time. As with some of the previous mastery events, there's a special loot item that you can get from Chicago jobs during this time, the Stray Pistol. I like these mastery events, and this is another one I can make use of. Keep em coming, Zynga.