Went to Charlotte, for the NRA Convention in May of this year. NC is a very "pro-gun" state, even open carry. (I lived in NC for 20 years,)
HOWEVER, the Convention Center is owned by the City Of Charlotte, hence Gov't property, ergo, NO Carry. They did not have signs posted, and I carried my Kershaw knife with pocket "clip", as I do everyday. Very little Police presence. No issues.
However, there was NO metal detectors, wanding, TSA "pat downs", etc,.... Somehow, I have a "gut" feeling "some" were carrying concealed.
PA, may be different, but TAB has covered the spectrum. The guns at the convention, unlike most gun shows, are not tie-wrapped, or tethered. You always love the sound at a booth when everyone is racking the slide, working the action, or cocking the hammers.
Yet, I could have walked in with a pocket full of M+P mags, grabbed one off the display, and made a mess of things. Judging by the crowd, this would have only been for a few seconds, before one would have been shot/ bum rushed, and disarmed, probably fatally. The NRA makes an attempt to NOT seem restrictive, but have to abide by local and state laws.
Now for the Freedom Rally, Glenn Beck, Ollie North, Sarah Palin, Chuck Norris, there was more security. But for the Ted Nugent Luncheon, Ted brought his guitar, and two AR's on stage, with mags, and replied:
"I don't believe in "gun free" zones,.....

I'm sure some PA residents here can provide the local info. That's just my two cents from the Charlotte Event.