Day/Time: Wednesday, Thursday and Saturday between 20:30 - 22:30 game time.
In every town from Skysong and beyond, there's a quest starter with a name containing "guard" or "array." (Example: Guard of South)
During this event you will be asked to kill 7 individual bosses in that area. You will receive tags upon defeating each boss. After you collect all 7 tags, you may turn all of them in at the Coordinator of Stars in Sunstream City.
Note: You do not have to have all 7 tags. You may choose to turn in 1-7 tags, but the more tags you turn in, the more experience you will receive.
MAPS AT:
http://jd-wiki.perfectworld.com/index.php/Astral_Tales