We've really been working on the sit-stays, too.
He did this after a great practice in the park Thursday. In the park there were two little kids watching us practice. When I had Ronin on a sit-stay, I was 15 meters away behind a car. The two kids wandered over and sat beside him and started petting him. He sat during the entire experience although he would rather have wiggled free, shook his tail, and kissed the kids. He was so good, he sat during the entire time until I returned and released him.
So today we got together again with some friends at a park and ran through all the exercises for Open and Utility. And he did many long sit-stays. He did them alone. He did them with other dogs. He did them with people and dogs walking around him. He did them with other dogs doing down stays. No Problem.
Tomorrow, we'll try again.