To make the mission done, you need to touch the red crysal, and every other inside the event area, running clock wise.

After you do this, a message will show up, asking you to meet Holiday Ghost.

To recive a hat, you need to trade him 10 Holiday Magic, that can be looted from Byg Byrds – huge (shared loot) mobs that are nesting at Carnap’s Landing, or are spawned at events.