If you are at least Level 12, you will see a pop-up inviting you to the Fall Festival! You will need to force close the game to see the update, which means to clear it from your mobile device's memory. You may even need to reboot your device.
Start off the event by tapping on the Event Green. Dressed as a Fall Fairgrounds, it is decorated with different food stalls that will surely let you get a taste of the season.
Finish the rare Fall Festival items List from September 6 to September 24 to get an exclusive 30-day visit from the Pumpkin Cat.