The 50,000 free tickets are valued at $4 million.
Six Flags said the guest, Bailey Breedlove, was removed because of her behavior towards police, employees, and guests, not the length of her shorts.
Cedar Fair is having to raise wages, step up recruitment and offer signing bonuses to fill available jobs.
The CDC still recommends that people aged 2 and older wear masks, but the Cedar Fair parks are only requiring masks for guests who are at least 10 years old.
The looser mask standards also mean guests do not have to wear face coverings while outdoor and physically distant from other parties.
The park reopened its rides on April 24 after a 16-month closure thanks to COVID-19.
Annual passholder previews for May 2-5 have already sold out.
The park says it will announce its full slate of COVID-19 protocols for 2021 on April 26.
The special events will follow the park's grand reopening on April 24.