Creature carnival. Nice so far but even before someone decided to kill off the statues, some other ones made "fun" by luring hoards of p2 mobs into the p1 players.
Might be worth a try to relocate the statues to the ruin city south east in dratan.
Hide and seek: Ok so far, except the usual speed problem when it comes to distant hiding places. Might be worth a try to hide in low level dungeons.
Quiz..... American trivia is something not really suitable for EU populated servers. As is a schedule fitting any american timezone.
There are often issues with starting time or locked quiz room doors, as has already been pointed out by other players here. Might be worth a try to give more ingame warnings before quiz starts.
Facebook activity is no event, only help in advertisement in my opinion. Forum events... not really my type of "game" but this is of course only personal opinion.