The big ones locally are in Amarillo and Lubbock. I've been to the Amarillo one in years past and it was nice. The AMA and LBB are more likely to get the high profile speakers. We have a nice little local Muster in Canyon, maybe 20 to 30 people. Sadly, the timing has been awful for us the last couple of years and we have missed it. Plainview has one that's about the same size or maybe a little bigger than Canyon. Went there a few years ago to say "Here" for my dad.
Any one would welcome you.
Its too late for this year, but if you contact the Association early enough, they will give you a mailing list for your area. If you can set one up for the far west Panhandle plus eastern Newer Mexico, you might get good numbers.