So here is the link to the Armstrong show, Reinin' In the Sun.
Entry forms are now available. Note that you need to click on each separate part of the entry form, in order to get the complete document. The show runs July 31st-August 2nd, and entries are due by July 3rd.
This show has a full slate of beginner (modified) classes, NRHA classes and working cowhorse classes. The show organizers emphasize a fun, relaxed atmosphere!