I received this just today which is too late for attending their hearing or sending in comments but via an email from Mike B. we have this:
Category A (Library Specific Violation)
Possession, except by law enforcement officers, of a firearm on Library property (with a valid permit),
Category E (Serious Violation Toward Person(s) or Property)
Possession, except by law enforcement officers, of a firearm on Library property (no valid permit).
So what they are saying is that even though the State has said local governments may not regulate firearm possession the city library is going to do it anyway. They recognize the existence of carry permits but will not honor them.
It sounds to me like it is time for a lawsuit. Email to appropriate people is in the works.