there will be a reboot tomorrow to apply some fixes.
There is no time set for the reboot yet, it will be announced shortly before.
After that reboot both the Event Item Mall will be gone.
Bought items obviously remain with you, you just wont be able to purchase any new ones.
The Cake NPC's will also be gone after that Reboot, so please make sure to do all your crafting before!
The Metin2SG Team