Requirements: level 15+
In this event, you can open chests and receive guaranteed prizes from each of them.
There are 45 chests in total and rewards drop on a random basis.

The main reward is Georgian National Opera Theater, size 7x9, can be placed anywhere
Every 24 hours: 4200 coins, 1-3 candies, 1-3 energy

Each chest can be opened with 9 Autumn Keys
There are 3 ways to get the Keys:

1. Completing quests
Key quests will appear one after the other in the menu on the left side

Harvest I - 3 keys
Ask friends for 5 repair kits
Produce 9 reinforcements (Cargo Port)
Collect 7 screw wrenches (in friends' cities; drop randomly)

Harvest II - 3 keys
Collect 8 pumps (Water Tower, Upgraded Water Tower)
Collect 21 jugs (Bakery, Upgraded Bakery)
Collect 16 valves (Premium cottage)

Harvest  III - 4 keys
Collect 6 books (School, Valley School)
Collect 17 maps of the stars (Stationery Shop, Upgraded Stationery Shop)
Collect 7 dandelions (in friends' cities; drop randomly)

2. Collect profits from certain buildings:
Lighthouse: 1 key every 24 hours
Student Campus: 1 key every 12 hours
Bruges City Hall: 2-3 keys every 24 hours
Hockey Hall of Fame: 2-3 keys every 24 hours
Mole Antonelliana: 2-3 keys every 24 hours

3. Purchasing keys from a special offer

Unique offer: Mole Antonelliana, size 5x6, can be placed anywhere

Every 24 hours: 4000 coins, 1-4 candies, 1-4 energy, 2-3 keys during the promotion