You can download the Event Cards here.
What is an Event Card?
Event cards 🎉 can really change the dynamics of each round and influence the way each player will decide how to build his/her park. They apply up to the end of the round/decade unless otherwise defined. Bonus or penalties indicated on the event cards are added or detracted at the end of each round/decade.
Event cards 🎉 must be shuffled at the beginning of the game and placed covered on the decade card, five for each decade. The Timekeeper flips the card and that card applies to the all players until the end of the decade.