For kids, or just a couple of goatlings, you don't need much stuff. It's when you take milker's along the amount of stuff you need trebles!
So, I will give you my general list which will probably have most things Anke has already mentioned!
White coat for you. A spare one is always handy too.
Clip or peg- for clipping your number to your white coat. If you tie the number to a goat it will eat it.
A food bowl
Waterbucket
Hay rack/haynet/haybag
Hay
Some concentrated food
Maybe some Alfalfa or something different to eat as they will be shut in all day and might be bored.
A goat coat (if you have them). Useful for white goats as they are so prone to getting dirty! It also helps their coat lie nice and smooth.
For kids, you might need some milk, a bottle etc whatever you give them milk with. This is especially important if you are staying overnight.
I use a tack box (a tool box) which we keep all our cleaning things in. Shampoo, sponges, brushes, coat whitener, coat shine spray, chalk, also a few medicinal items, like something to help stop them scouring, veterinary wound powder etc. I also keep fly repellant and sunscreen in there- for both human and adult use! And water free antibacterial hand wash.
A small bucket is useful if you need to sponge off a dirty mark on the goat.
Smart collars
Clip leads- you might want to tie the kids up while you give them a quick brush, or use a short clip lead for showing.
A folding chair for you to sit in!
A tarpaulin or 2/3/4 of them. Useful for lots of things, if it's windy or cold, put them round the outside of the pen to keep out the drafts, use them to keep kids escaping through pens, or sometimes to keep your kids out of your tack pen, or from stealing the goat next door's food. For the tarpaulin's you will then need either clips, bungee cords or string, to tie them up with.
Movement form
Your tickets for the show.
If you stay at the show overnight yourself, the list expands for things you need as well!
Thats all I can think of for just now.
Beth