It is a difficult job to run a driving event. It is even more difficult when the event is well attended.
I am a member of my region's track safety tech. inspection team. The perameters for Tech inspections are clearly defined as to details about the car and who may inspect the car. Our DE events are open to other marques.
We require that the tech inspection be done by a dealer of that marque, a
PCA regional tech inspector (or facility), or an ASE certified facility with the receipt of that facility that perfomed the inspection. Time and time again we are presented with cars and drivers that are experienced that do not comply with what was requested. So what happens? We give the person a hard time, and eventually will perform the tech inspection at a time that works for us. The driver usually gets ticked off at us, but later realizes that it was his mistake. He should have taken the time to read our forms, and handbook.
There is a lot of planning and work that goes into the event. It is a shame that they could not have come so some compromise to help to accomidate you. Maybe, you wouldn't have been able to participate in all of the days activities, but that is how the cookie crumbles. Next time, make sure all your t's are crossed and i's are dotted. It is only one event. It looks like a big deal now, but 10 years from now, it will be insignifigant. Be aware there are some regions in the eastern part of the U.S. that are a bit more rigid than others (I am not say NER is, I never have attended any of thier events)
Give NER another chance. You may change your mind about them.