How do Premium prizes work for this festival?

Articles in this section

• What is the Festival of Fears event about?
• How long does the event last?
• How do I join the event?
• Is this like the past Trick-or-Treat? Will I still be able to get the Goodie Bags?
• How does finding the Goodie Bags work?
• Do I have to read the clues to find the Goodie Bags?
• What's inside the Goodie Bags? Am I guaranteed everything inside if I open it?
• Do I have to open the Goodie Bags before the event ends?
• I found a Goodie Bag, and it said I found a book, but I don't see one in my inventory. What do I do?
• Do I have to open the Goodie Bag to get the book?