Hey Bro, @Klistnakov
They've posted an announcement for this one.
2. Black Sun event where rewards will increase x5 after June 8 update
For all Adventurers to receive the increased rewards and benefits from the event, obtaining rewards for Black Sun this Sunday (June 6) will be temporarily unavailable until the maintenance expected on June 8.
※ Black Sun Rewards may be obtained after the June 8 update
We'll have to wait for the update.
https://www.world.blackdesertm.com/Ocean/News/Detail?boardNo=1171