There will, in fact, be a Star Wars Battlefront 2 Halloween event this year. Shared on EA Star Wars' official Twitter account, the event will begin on October 23 and end on October 31.
The event might not feature ghouls and ghosts, but it will allow players to earn 2X experience for the entire period. That includes all game modes.
The event will center around the Ewok hunt on Endor, which, unsurprisingly, will be at night.
It's worth mentioning that Battlefront 2 will have events the entire month of October, even though there is only one Halloween-themed event.