Treehouse of Horror XXXI Event

 is the 5th multi-event of 2020 and the 11th multi-event overall. It was released on October 14, 2020, and ended on November 18, 2020.

Similar to previous multi-events, it was divided into 4 acts:
 * Act 1: October 14, 2020 - November 18, 2020
 * Act 2: October 23, 2020 - November 18, 2020
 * Act 3: November 1, 2020 - November 18, 2020
 * Act 4: November 10, 2020 - November 18, 2020

Trivia

 * Most of the event’s theme and new content is based on Season 5, Episode 5 “Treehouse of Horror IV” segment “The Devil and Homer Simpson”, Season 24, Episode 15 “Black-Eyed, Please” and Season 26, Episode 4 “Treehouse of Horror XXV” segment “School is Hell”.
 * The update brought a few changes with it:
 * The item limit was increased by 1000 items in Springfield going from the cap of 13000 to 14000 items.
 * Alcatraaaz's 60m job "Raise His Sneaker Game" and 8h job "Enjoy His Financial Security" requirements were fixed.
 * The locations for the freemium characters' currency tasks was changed back to Springfield Elementary or Brown House instead of the Heights Theater or Brown House in the Sidekicked Aside questline.
 * A patch update was released on October 15 which included some more changes:
 * The music was changed to the Treehouse of Horror music for the event.
 * Leaves fall on the screen.
 * Rivers were changed to the darker versions from previous Treehouse of Horror events (excluding the XXIV and XXV events which were different to the darker river).
 * The loading screen illustration has a coloring mistake, giving Beelzebart and Lisafer's legs their usual yellow color.