The email came more than a month before the first Orange County inspection of Fun Spot's Orlando location.
Disney World is asking guests who can't wear a face mask to reschedule their visits for a later date.
The event will offer holiday stage shows, light displays, and seasonal food, with single-day tickets costing $20.
The 52-mph, 113-foot-tall coaster will be built by Idaho's own Rocky Mountain Construction.
The IAAPA Expo will instead go virtual for 2020.
The reports obtained by Theme Park Tribune found many Fun Spot guests were not wearing masks after Orange County, Florida's mask mandate went into effect.