The great thing about the horse community is that there are many different groups to join and that affords you the opportunity to be exposed to other trainers, breeders and discipline specific breed organizations. Most groups are regional and nationwide and are easy to join. There are opportunities to join specific breed groups depending on the breed of your horse, for example, The American Paint Horse Organization supports the Paint Horse breed and is nationwide and also supports regional shows and organizations. There are also discipline specific organizations that are available if you are involved in hunters/jumpers, trail riding, dressage, team roping, cutting horses etc. You can do an internet search for the breed or discipline specific sector your involved in.