Cedar Fair says it will fill 45,000 seasonal positions across its parks for the 2021 season.
The theme park chain lost $590 million in 2020, but expects 2021 to be an improvement.
The event will run on select dates from March 5 through May 2.
The list includes California's Great America, even with the state's stringent reopening guidelines.
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Disney did not say how long the Hall of Presidents refurbishment would last.
The $27 million resort will be called Kings Island Camp Cedar, located less than a mile from the park gates.
One of the barges for "Harmonious" will begin testing on Epcot's World Showcase Lagoon very soon.
The limited-capacity event will feature seasonal food as well as some family rides and at least one roller coaster.