The USDF Connection had an informative article in last month's issue. In fact, Etian Beth-Halachmy (who I think is one of the founders of the western dressage movement), was on the cover. I suspect western dressage will continue to grow, and I think the USDF feels so as well. They've welcomed, or so it seems, the western dressage riders and are quickly making room for them. Good for USDF. I am finding that Dressage is not an overwhelmingly popular sport amongst the masses. Being more inclusive might help change that. It's funny that I seem to choose disciplines that are less than mainstream.
With that said, the Tehachapi Mountain Chapter of CDS is offering a range of Western Dressage classes at all four of their 2012 CDS-rated summer shows. The first show is June 24, 2012. Here are PDFs of the show premium and the western dressage entry form for that show. You can also find them here.
Just a quick P.S. I saw Etian Beth-Halachmy at the Pomona Horse Expo this winter and was quite impressed with his riding. He's obviously very accomplished at what he does, and using dressage to improve a western horse seems to really work. If you missed that blog post, you can catch it here.