I too feel for the clients, youth, and friends involved who may not get their horses shown because they relied on someone else, however...
I feel for the exhibitor who worked their butt off and met the deadlines, followed the rules, and will lose to the exhibitor who did not. If I was that exhibitor, I would be angry and I would lose faith in AMHR.
I think it's a little silly that they don't allow post entries, but the fact is, they don't. They haven't. The deadline was not a surprise, it wasn't the result of a rule change, it did not come out of no where.
This is not about all those things the original poster stated. These late entrants were careless and/or forgetful and that's all there is to it. Rules are rules and they are not meant to be broken. What is the point to a deadline if we allow a grace period? What happens when someone wants a grace period to the grace period?
I don't think these horses should be allowed to show. If they do let them in, AMHR will open itself up to a huge can of worms. If let in, the next time someone missed a deadline or a rule is in question, this incident will be referenced and AMHR will have no ground to stand on. I'm sorry to those who this effects. You need to look to the people who let you down, not the registry who gave you everything you needed to get entered. AMHR did its job, these 6 entrants did not. It is an unfortunate mistake that these trainers/exhibitors will never make again, I'm sure.