It's both. There are halter, showmanship gaming, pee wee classes, leadline classes for youngsters and gaming and jumping. But I'm doing western, halter, and showmanship
Well I do show jumping so I can really help you there. I showed by myself till I was advanced enough to do gold shows but here is what I bring...
Tack: Saddle, bridle (nice one's) cinch (i switched it to western) saddle pad, any kind of boots you use, breastplate (if you use one)
Show clothes: (this is for english shows so i not sure what is the same) Helmet, hairnets, spurs and crop, show boots, paddock boots (just in case) gloves (if you use them) riding jacket, show shirt, show pants, socks (i forget everything so I bring extra)
Horse clothes: Travel boots, fly mask (Sometimes needed), cooler
Supplies: fly spray, grooming supplies, hoof polish, all your brushes,show sheen(not always needed but..) little clippers for touch ups, lunge line and whip, waterless shampoo, halter and lead rope a nice and ugly pair, sweat scraper,braiding elastics (if you banded etc..) leather wipes or cleaner, wash bucket (always needed), rags,sponges, mane and tail detangler, braiding comb,
Feed: Hay, Feed buckets, water buckets (usually two), treats
Stall: Forks, broom, stall guard and a tying rope.
Here is a couple tips!!
If you own a mare wash her milk bag before doing halter (some judges check for that) And around he or she's dock and eyes!! :)