2017 Hallowe'en event

Ghost Stories of Gielinor is the 2017 Hallowe'en event. It was released on 30 October 2017. During the event, players help Closure track down nine ghosts to collect their last moments. Ironmen can participate in the event.

Heralds of the Apocalypse
The ghost can be found northeast of the Edgeville lodestone, immediately south of the Widlerness Wall.

Bring 1 item of food, and a bucket of water.

Family Reunion
South-west of Varrock lodestone. Follow the ghost upstairs in the pub. Pose in the mirror to distract the ghost. Find a spooky outfit in a wardrobe, wear it and distract him again.

By the Light of the Moon
The ghost can be found west of the Falador north gate.

After speaking to the ghost, it will move outside the Rising Sun Inn. Speak to it again and it will tell you to head upstairs, to find a werewolf in order to avenge it. There are 6 NPCs upstairs, and the available dialog options are: Wrongly accusing an NPC of being the werewolf would result in the death of said NPC. Accuse everyone until the werewolf is found. Return to the ghost to complete this section. Daniel is the werewolf, and he is at the northwest corner of the room.
 * Where were you on the full moon?
 * Did you see anything suspicious?
 * Who do you suspect of being the werewolf?
 * [Accuse (NPC) of being the werewolf.]

Rewards
Halloween mask overrides

Trivia

 * Some of the stories in the event were written by players, while others were written by Mod Raven, Scorpio, Mohawk, Rowley, and Osborne.