Most booth problems on show day come from one forgotten item: no zip ties, no change, no way to charge a phone. Use this list as a base, delete what does not apply to your craft, and keep the finished version in your phone so you pack the same way every time.
Booth structure
Tent or canopy with side walls, plus weights for every leg (35 to 40 pounds per leg is a common rule; many shows require them)
Tables, table covers that reach the ground, and risers or shelving for height
Floor mat or rug if the show is on grass or concrete
Zip ties, clamps, clips, bungee cords, duct tape and a small tool kit
Signage with your business name, and a sign for your payment options
Lighting for early or late hours, with spare batteries or a power source you have cleared with the organizer
Products and display
Inventory with a margin for the best sellers, since a sell-out costs more than leftover stock
Price tags on every item or clearly posted price signs
Bags, tissue or boxes for wrapping, and extras of whatever packaging you use
Mirror, if you sell anything people wear
Business cards, a mailing list sign-up and any care or story cards
A repair kit for the display itself: extra hooks, glue, tape and a spare tablecloth
Payments and paperwork
Card reader, fully charged, with a backup way to take payment if your signal drops
A cash box with small bills and coins for change
Your seller's permit or sales tax license if your state requires one, and a copy of your show confirmation
Proof of insurance if the show asks for it
A notebook or app for logging each show's sales, costs and weather, so you can judge whether to apply again
Comfort and the small things
Chair or stool, water, snacks and sunscreen or a rain layer
Hand sanitizer, wipes, paper towels and a trash bag
Phone charger and a battery pack
A hand truck or wagon for load-in, and a plan for where to park
A friend or helper for breaks, because leaving a booth alone for lunch costs sales
Save listings, keep application deadlines in one place, and read what vendors who have worked a show say about it before you commit to a booth fee in your area.