Big bang 3rd of december? Does this screenshot seem legit?

This seems fake to me. The event description for this event is almost the same as the "Maple World Remembered..." event going on right now. Especially the line "Before we turn the page, let's celebrate the Story!" being exactly the same on this screenshot and on the current, real event. To me, it doesn't make any sense for a post-BB event to say "Before we turn the page"

Also, it says "The Big Bang has change everything" instead of "changed everything". I've never seen Nexon so lax about describing an event that they blatantly copied the description from a previous event and changed only a few words around, not even bothering to make it make complete sense.
EDIT: Especially an event that involves real world prizes.