Multiple waves of enemies will spawn in. Once you've defeated them, a rewards chest will appear which you need to attack. As soon as this has been destroyed, everyone involved will receive a token per post which they can exchange for rewards.
Once the chest has been destroyed, the GM will announce the next phase. Please remove all crystals from your equipment to make sure you don't lose them.
Note: The GM present for the event will be busy dealing with running the event for its duration. Please continue to use the support ticket system for your questions/problems.