I've probably forgotten something, but here is what SWMBO and I usually take:
Camping/outdoor stuff:
Tent & Footprint (Note - get a good tent. Oshkosh T-storms tend to find all the leaks in cheap ones)
Thermarest air mattresses
3 sheets, two fleece blankets, two camping pillows
Soft side cooler
two aluminum folding chairs
Sunscreen
Bug repellant
Bath towels (our worst ones - we toss 'em at the end of the show).
shower shoes
LED flashlights (headband type)
garbage bags.
Clothes:
undergarments & socks
1 pr jeans each
Shorts and shirts for the duration of the stay.
Windbreakers
Ponchos
1 long sleeve shirt each
1 hat each
Other:
sunglasses
cameras
toiletries
earplugs
books (1 ea)
Itenerary - list of places and times of forums we want to attend.
Airplane Stuff:
Tie-downs
Tools
Maps
NOTAM/Procedures
extra AA batteries
Ipod
Headsets
GPS
2 - 6"x12" pieces of plywood to go under the main wheels in the parking area (to prevent sinking in, if the soil is soft).
This list usually comes out to about 85 lbs of stuff.