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The shaking the head is normal. Or at least it's nothing to be concerned about. I've seen birds of all breeds and ages do it. The same goes for "digging in their feathers like they had bugs". Watch a day old chick some time for any length of time and you'll see them do it too.
Having said that, changing clothes before making the rounds on your place after coming home from a show is a good thing to do. It's also a good idea to quarantine your birds for two weeks after coming home from a show.
But, having said that, I feel I must emphasize that the vast majority of all folks who show birds take great care to prevent their birds from getting anything and would not even think about doing something that might bring harm to others birds at the show. The Show Superintendent, judges, and others would pull a bird at the first sign of a possible illness. From the shows I've been to, they just don't take any chances.
There are also a number of visitors that come to the show just to see the birds. And most of those folks are not bringing birds with them so the risk is VERY minimal.
God Bless,