Get a chair and sit quietly in the run with the feed pan a little ways away. Just sit quietly, the next day move the chair a little close to the pan, and again, do not grab, just sit quietly. By the third day, again move more closely to the feed, but only put a little out, feed that when it is gone, call quietly, "Here chick, chick.." shake the can and then gently pour out just a little more. Repeat.
Within a week, they will calm down considerably. Many birds are very uncomfortable being handled, but most will calm down with a feed.
If you ever just have to get a hold of a bird, use a fish net, with a handle, the kind for scooping a fish into a boat. It works very well at nearly dark, but you can catch something pretty successfully with a net. Then put them into the cage, and take the cage to the show.
Mrs K