To start Early Maggie you need to have all 4 act 2 buildings placed and have completed Oh Come, All Ye Vengeful Pt. 4. You’ve time till January 2nd at 8am GMT to trigger it.
Note: The Starter Pack promo only appear if you begin a new town!
Meanwhile you can also check out the video that unlocks once you get Maggie right here:
Check out our event page, and its various sections for each Act (Early Maggie and the two promos are part of Act 2), and keep coming back for all the info you’ll need!