Cool. Thanks for the info. I am looking forward to going to the show!!!There are many adult chickens available for purchase. There is a specific barn/building set aside for sales. Yes, you can take them home immediately. Best to bring yourself a crate or two, although there may be boxes available for purchase.
There was someone with chicks last year. I don't know that that is typical or if there will be any this year.
The variety of what breeds are available changes year to year.
Bring cash and a cell phone.
If you want specific chickens, it is often possible to arrange with a breeder in advance to bring stock just for you. If you do that, please do make sure that you follow through and don't leave the breeder hanging.