Need your help (again)

When does the Christmas event actually end. I remember last time, on the Halloween event, I didn’t grind enough for a creature that I wanted so I just kinda wasted my time (I was so close).

So, to not miss my beautiful, underrated king (Yohsog, cuz I’ve bought the jothunnel before), I just need the EXACT date of the end of the event.

Thanks a lot, and have a Happy New Year!