I don't see why not but the rule are no mask other than that your good to go
It depends on a variety of things. Danielle Burger's reply is best suited for you.
There are age limits and costume limits at both parks.
No they are considered a health and safety issue
I feel like there was a sign at the entrance that clearly said no costumes were allowed. From their FAQ: Attire that is not appropriate for the theme parks (and which may result in refusal of admittance or ejection) includes but is not limited to: Costumes may not be worn by Guests 14 years of age or older Masks may not be worn by Guests 14 years of age or older (unless they are for medical purposes)
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