USDF’s clinics were Adult Clinics, not AA clinics. So they were for both open and AA riders.
I’ll tell you what my chapter did a few years ago for lower level riders. We called it “the Journey to 2nd Level”, and we hired Janet Foy and Sue Curry (both are EXCELLENT clinicians), and ran a series of 3 weekends spread out over about 3 months. We had riders and horses at various levels from intro to “almost 2nd level”. The same riders and horses rode all three weekends. The instruction was specific to their level and what they needed to work on and develop to get to the next level (aka the Intro rider and horse worked on canter transitions and steering in the canter, and keeping the canter from gaining too much steam and losing balance, the “almost 2nd level” team worked on better collection and balance, and suppleness for 2nd level work).
We watched the progression over that 3 month period, and every, single rider and horse improved. Ours wasn’t aimed at the AA rider, but more at the “grass roots” rider - we had a few trainers who teach up-down, we had a couple of juniors, and then we had AA riders.
Our goal was to help the rider make that jump to the next level, and to show the auditors the progression to take a horse from intro to 2nd level, and how you build on the basics.
Both Janet and Sue were super with the horses, riders, and auditors. I would recommend either one.
There are a lot of excellent clinicians. I’ve audited or ridden with almost all the recommendations on this thread so far, and several are good. A few are NOT so great with beginners, or less fancy horses, so keep that in mind. And some are better at working directly on rider biomechanics, others are better at using exercises to try to correct rider issues. So it kind of depends on what you are looking for.
CDS has done an AA clinic every year - their list of clinicians have included:
Walter Zettl
Debbie McDonald
Rachel Saavedra
Hilda Gurney
Sabine Schutt Kerry
Melissa Creswick
Volker Bromman
And I’m sure I’ve left out some names. Some of those were better then others. Some were better with advanced riders, some were better with lower level riders, and a few were pretty good with everyone. I’ve ridden in a few of the clinics, and audited a few more over the decades.