Bring a fixed budget and track spending as you go. Cash is useful because some dealers prefer it and venue connectivity can make card readers unreliable, but carry a safer backup rather than a large visible roll. Add a focused want list, recent sold-price references for expensive targets, sleeves, top loaders or a compact case, and a power bank. Comfortable shoes and water matter at a multi-hour event more than another binder.
If you plan to trade or sell, organize cards by category and approximate value, photograph important items, and know which pieces are not available. Do not carry an entire collection simply because it fits in the car. Review the upcoming event calendar for admission, hours, bag rules, and venue details, then use the card show guide for a fuller checklist. Nearby local card shops can be a backup if the show does not have what you need. Keep bags closed, confirm every card and amount before money changes hands, and never leave valuable cards unattended while negotiating another deal.