Welcome to eplaya. It is good to ask reasonable questions before ending up on the real playa unprepared.
Besides properly stacking your tent down, your tent fly must be secured also. Do not depend on little plastic hooks. Tie that sucker down.
To provide inexpensive shade, you might try stacking down a shade cloth over all your tent and fly. Use guylines and heavy stakes again. You might even use some failsafe ropes also. Storing your water jugs inside at the corners will weigh down your lightweight tent also. Some folks tie their tent to their car bumper. We are carcamping here, not backpacking.
Small picnic shade structures are renowned for their flimsyness, I'm inclined toward heavy 8 leg carports. In all cases anchor legs, crosstie members; and brace, tape, and secure connections and tarps. Duct tape is your friend, same for painters tape.
Your neighbors will appreciate your extra efforts in protecting thier stuff from your possibly wayward stuff.
Check your tent for mesh walls, windows now, today. Set it up. See if you got all the parts, now, today. Figure out a way to cover or close mesh. Dust will get in anyway, but you don't have to suffer. Bring a brush and dustpan. Cover your bed when you are not in it. Close and lock your door when you leave. Keep your stuff picked up.
Oh, don't forget your sleeping bag. Luckily I had an extra bag for a neighbor, once. I use a foam mattress, sheets, quilts, duvet's, extra pillows. Your milage might vary... Less than 3 weeks to go, I got's stuff . Do you?
A starving man will eat with the wolf.