Adventureland is now under the same umbrella as Kennywood and Dutch Wonderland.
The 50,000 free tickets are valued at $4 million.
The special events will follow the park's grand reopening on April 24.
The park will be able to operate at 25% capacity thanks to the state's progress on COVID-19 vaccinations.
Cedar Fair says it will fill 45,000 seasonal positions across its parks for the 2021 season.
Several parks' reopening dates depend on government COVID-19 guidelines.
The list includes California's Great America, even with the state's stringent reopening guidelines.
2021 will see the opening of a brand new Legoland park as well as the world's fastest multi-launch coaster.