Posting this as my current "checklist" for Days of Knights, but probably useful for any camping event. Some of it is slightly generic, like having chausses and cuisses on the same list. If anybody has suggestions/additions, let me know!
ARMOR
Helmet
Coif
Gorget
Breastplate
Backplate
Fauld
Pauldrons / Spaulders
Voiders
Elbow Cops
Arms / Vambraces
Gauntlets
Chausses
Cuisses
Knee Cops
Greaves
Sabatons
Boots / Armor shoes
Spurs!
Garter!
WEAPONS
Sword
Axe
Mace
War Hammer
Polearm
Dagger
Bow
Arrows
ARMOR/WEAPONS ACCESSORIES
Sword Belt
Arming Coat
Gambeson
Padded Chausses
Padding for greaves
Points
TENT
Actual tent canvas
Dining fly
Poles (Tent)
Poles (Fly)
Ropes
Stakes (for ropes)
Stakes (perimeter)
TENT ACCESSORIES
Finials
Flooring / Rugs
Lantern hooks / Shelving brackets
Fire Source / Period Fire Kit
SOFT KIT
Hat
Mantle
Shirt
Under-shirt
Bracers (vambraces)
Gloves
Braies
Chausses
Pants
Socks
Shoes
SOFT KIT ACCESSORIES
Knightly chain
Pater noster
Belt
Pouch(es)
Extra Socks
Extra underwear
Sewing kit (needles and thread, maybe fabric patches, for on-site repairs)
FURNITURE
Bed(s)
Bench(es)
Table(s)
Chest(s) / Chest(s) with super-ninja hidden non-period ice chest/cooler
Dining Table & Benches
Pegs / Wedges / Rope for furniture
Tablecloth / runners
Blankets / Pillows / Furs
Chairs
Mattresses / Pads
Rubber Mallet (for tapping in pegs / wedges)
Steel hammer (for setting stakes)
Weapon rack(s)
TABLEWARE
Large plates
Small plates
Fork ("Pricker")
Spoon
Knife (eating)
Tankard / Drinking cup(s) / Goblets
HERALDRY
Banner / Pennant
Gonfalon
RATIONS (if not purchasing on-site / nearby)
Food
Drinks
Snacks
Water
Ice
MISC
Band Aids / Medical Supplies
Lanterns / Candles
Books
Scoreboards (for demos/score keeping)
Scissors
Extra leather / laces
Leather rotary punch
Mail tools
Portable strap/buckle repair tools
Extra strap(s) / buckle(s)
Wasters
Fencing Gear
Gentlemanly protector (aka "cup")
Toiletries
Rust prevention and removal (oil, wax, scrubbies, sanding sponge, etc)
Bug spray
Sun screen
Medications (prescriptions, aleve, tylenol, advil, etc)
Campfire stuff - long rods for roasting marshmellows, hot dogs, etc
Deodorant
Toothbrush / toothpaste
Pad locks (for chests)
Spare rope (various lengths)