Actually it should have been in three different worlds. However there hasn't been any news so far of a Halloween event on Fallen Earth. My guess is that they are still with their hands full with the influx of players due to the switch to free to play.
Which two worlds will be covered then? It will be Everquest 2's Norrath where it is pretty much old hat to me now and Final Fantasy XIV's Eorzea where not only it is the first time for me but for the game too I think.
Currently they are my main poison as far as MMORPGs go therefore that is the reason I am only making a post about them. And not covering other games which I technically still play... like... Lord of the Rings Online. >_>
Anyway, read on if you are curious to see what was new on this year's Everquest 2 "Nights of the Dead" or about Final Fantasy XIV's "All Saint's Wake".