I still remember as a kid (to give you an idea of the era - US Air was Allegheny Airlines. Dad got called in to work oh the HVAC system at LGA airport one Saturday, and decided to take me as a helper - both of us got changed into our work clothes, and off we went. The guards were like "we can't let you/your truck in" Dad had a real simple answer to that "Fine" - took out his clipboard with the work/job sheet on it, and wrote "Denied entry to Job site by (name of guard here) at (time)" and handed it to the guard and said "Please sign here" - Guard decided to call management, and they were like "YES, he is allowed in, just needs escort" - we were allowed in

He had a very simple rule - I go where I need to go with my tools - you don't want me/my tools there, no problem. I'll leave, and note that you denied me entry, so that when the customer calls and says "You didn't fix XXX" Dad's boss could say "We showed up, were denied entry by so and so - oh, and here is your bill for our time"

I take the same attitude - if you have asked ME to show up, I'm bringing what I need to do the job, and my EDC. YOU can modify YOUR rules to fit ME - my rules are "I carry my EDC". Now, if I'm the one who is requesting entry (Movie theatre, an airplane flight, etc), I'll fit your rules, if I don't like them, I can leave. It's a 2 way street