Hello. Once the place was posted "No Concealed Carry" I would have been working to get the sign down. If that failed, first thing to do would've been totell the owner WHY I wasn't coming back, and just found a new hangout. Socializing with friends be damned that gun on my hip is more important than spending chit-chat time with them, to be very blunt about it.
For me, chances are that this would have been settled one way or another by the time that LEO came into the picture.