Where are the shows? I'd like to watch one sometime. Also, are there open shows for grade minis? I used to show Quarter Horses and I'm interested in showing minis to get back in the ring.
I googled American Miniature Horse and found this show schedule link: https://www.amha.org/show-schedules-info
And you've got the World Equestrian Centre in Wilmington... got to be some fantastic shows there!