PC Your character card - printed from the on-line registration systems.
Print Your Character Sheet - Make sure you have an updated copy of your character from LARPortal.com.
Pack for the Weather (cannot stress enough)
Medicine - Prescriptions, inhalers, or other medical needs. Be sure you inform staff and include them on your Medical Waiver form.
Socks & Extra Socks - You should change your socks often. If your socks are damp or wet, you will be miserable. Bring twice as many socks as you think you'll need.
three blue glowing headbands in case you need to be non-combat
PC: Blank index cards for gather Components
Bug Spray and Sunscreen
NPC: Basic blacks - shirt, pants, socks, suitable shoes. no logos (If needed spats can fix this)
PC: Character Costuming - You do not need to get elaborate out of the gate. You just don't want to be wearing modern-looking clothes. You can find some good clothes online or even from other players at events.
PC: Character Accessories - These are items that give you character something extra. Drinking steins, pouches, sashes, bandannas, etc.
Belt, Belt Pouch
NPC: personal Balaklava and wrist play card holder
Consider a suitable in game water flask that fits your bouch or hangs from the belt
Returning PC: Sheet, Cards & Phys-Reps - Make sure you have your current character sheets and all phys-reps (physical representation) for your items. And any active Inflict Cards on you and Item Cards for the items you are bringing.
PC: Cabin Decorations - Players love to add flair to their cabins. Nothing helps immersion more when you're hanging out in the cabin than a fully decked-out room. Some people bring rugs, tapestries, chests, and other displays or period-looking items. Trying to make the room feel like something other than a cabin.