I've put some links along the right side for AKC show superintendents. You can check any of them for upcoming shows and obedience, rally, and agility trials in your area. InfoDog is probably the best, they list all the upcoming shows, and you can get results from the shows they are superintending. Onofrio and Jones only list their shows. ASFA is a great resource for lure coursing.
If anyone has any good links for any other dog sports, let me know, and I will add it!