Into the Simpsonsverse 2021 Event

 was the 4th multi-event of 2021 and the 16th multi-event overall. It was released on August 4, 2021, one week after the conclusion of Tavern Trouble 2021 Event and ended on September 8, 2021.

Similar to previous multi-events, it was divided into four acts:
 * Act 1: August 4, 2021 - September 8, 2021
 * Act 2: August 13, 2021 - September 8, 2021
 * Act 3: August 22, 2021 - September 8, 2021
 * Act 4: August 31, 2021 - September 8, 2021

"Workers are lazy. Robots are pricey. But alternative reality Homers will work for donuts on the dollar! Mr. Burns has over-exploited this timeline, so he's moving on to the multiverse. But as my Aunt Carol always said: "Don't mess with the time-space continuum," and dark forces are soon unleashed in Springfield. Will the army of dimwitted Homers be able to save the town? Will there be enough donuts to feed them all? And was it wrong for us to have Carol committed?"

- event's description.

Trivia

 * Most of the event's theme and new content is based on the Season 32, Episode 4 "Treehouse of Horror XXXI" segment "Into the Homer-verse".