Klei Entertainment's lovable death simulator Don't Starve Together's Halloween 2019 event is the return of Hallowed Nights, starting October 24. The Klei blog post announcing the event's return said it'll largely include the same things as last year, with a few new treats and tricks.
That means Candy items, Halloween Decorations, and Trinkets you can give to the Pig King for Candy. Candy is good in Don't Starve, because unlike other food items, it never spoils.
Last year's Hallowed Nights also introduced the Mad Science Lab, where you could engineer a number of potions with a variety of positive effects — but at the expense of your sanity.
Though not technically part of Hallowed Nights, October 24 is when we'll see Wurt the Merm make her debut in Don't Starve as well.