Trixie has returned this year to pass out the treats (once every 60 minutes). You would simply click "Trick or Treat" and Trixie would give you a random item from the pool of possible items. Like the Halloweens before, Trixie's clock resets at every hour on the hour, allowing players to collect an item at 3:59 and then again at 4:00, for example. The event started on October 24, 2019 and is ongoing. This year a new openable, in form of Gravestones, can randomly be found while navigating the site. Upon being opened, the Gravestone itself disappears from the player's inventory, replaced by the item that was inside. The Solarian Crate Halloween was also released alongside this event as well.
This year Gravestones took the spotlight (thanks to Splinter) and each gravestone will give you three items upon opening.
Door Trick or Treating