I believe the OP specifically stated the "Denver Zoo". I this case, is not the Zoo a PUBLIC entity (owned by a governmental agency?)
If it is, state preemption over-rules the Zoo. Posting invalid and unenforcable, they would not even be able to ask you to leave,
If the Zoo is a private entity, their rule is valid.
The rule is, if it is owned by the government, the law is what counts, not the sign, or lack of sign.
If is private property, the property owner can do what he pleases, and so can I. Posted, I just don't go there. Here in WA by law signs mean nothing, they have to personally ask you to leave, however, that is not how I operate. They post no guns, I will respect their posting, and send them a no-guns, no money card.
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