I was there for a Christmas musical special last December. Wands were used, and there were official police officers present. I saw several men sent back to their cars to stow their pocket knives, and a few were surrendered rather than make the long walk back to the car. I did not see any firearms, but as the word spread down the line of the wands I did see some men leave the line and walk away. May have been CCing, or maybe just knives.
As said above, it depends on the attraction.
I believe they are off duty police, I have not seen any "wanding" just visual check of waist band lift shirt etc. That has been for concerts not sure they were that nosy at say Festival of Trees.