The Trick or Treat DLC includes:
• Celebrate Halloween with a new in-game festival & updated themed environment
• Night-time sweet collecting mini game:
o Trick or Treat! Fill your sweets bag with treats gifted by each NPC. At max capacity, leave it near a dino spawn of your choice. The next morning a new Halloween-themed dino skin will appear for you to befriend.
o Beware! You must avoid being ‘tricked’ by an NPC, losing your sweets and wearing a pumpkin for the rest of the night.
o Watch the clock! The player will be forced to sleep at the usual time, so be sure to get your sweets before bedtime.

More details on the official game page of Paleo Pines Trick or Treat DLC ...