AirVenture is littered with "WalMart" tents after a big wind and rain.
The problems are the fiberglass poles and partial rain-flys.

First of all, you will want a tent with a full rain-fly... one that goes
all the way from the top to the ground.

Second, you will want to affix additional guy-lines to stabilize the
weak poles.

As for sleeping, a good Thermarest pad, a 40-degree sleeping bag, and a
300-weight fleece blanket will keep you warm the coldest OSH nights.
Total weight will be less than 5-pounds.