Here’s how it works:
Event Duration: September 18 – October 16 (before maintenance)
Rewards: 7-Day Premium Membership and Radiant Nebula Stone. Membership and items can only be received once per account. The Radiant Nebula Stone can be claimed through your in-game mailbox. The 7-Day Premium Membership will begin immediately after your rewards have been sent to your account on Wednesday after the maintenance.
Qualification: Complete Chapter 1: Awakenings on a Zen Archer to receive the Radiant Nebula Stone and get your Zen Archer to level 60 to receive the 7-Day Premium Membership.
Redemption Period: Every Wednesday after the maintenance, while the level-up event is active, rewards will be sent to all qualifying accounts.
....... so why FRIDAY? or we need to say ooo thx cuz we get it, if is friday , monday or next year - something like that ? so thx for friday