I just went to their site... .shetlandminiature and if you hold your mouse over "Member Services", it will show links, and go into "Upcoming Events". Then you can go in there, and go by the month, and see what shows are coming up.
There are 4 shows that we in Washington usually attend for AMHR. That is the Spring Fling in Eugene, OR in April, Pacific Crown is usually in May (Lynden), Washington Shetland Pony in June (Lynden), and finish up with Evergreen in July (Spanaway, WA). There used to be a show in Eastern WA, but no longer, not for a long time. I think there are one or two in Idaho and also Utah.
There just aren't as many shows as there used to be.