You're getting good advice on stability for your tent. Practice setting up a few times until you're satisfied - it will make load-in and load-out go a lot quicker, too.
Here are a few pics from my old setup. I have an old EZ Up style, with 4 walls. None with windows: everything can be pulled back and velcroed into place. Note the sandbags in front - often times, you may own the ground stakes, but be placed on sidewalks or other pavement, so sandbags are necessary. Plus, they're a better guarantee against high winds!
I think I had pegboard on the side for hanging the framed stuff. Sorry these images are small: I was amusing myself shooting an old Duoflex camera and these are just old negative scans.
We had a van back then, so it was easy to load up that oak table in the back that's holding the bins. If you plan on having some smaller pieces, you might want to slip some foam core or a piece of heavy cardstock into a plastic photo/art craft bag.
Here's an example. They come in all sizes. If you're only interested in hanging your work, then this type of "matted & bagged" approach may not even be needed! I stacked mine up in old wooden wine crates.
You mentioned putting down an outdoor carpet: just beware of folks with strollers, canes, walkers, dogs, and other things that might cause needless tripping over a corner.
Another nice touch are copies of your bio, if you have one. If you want people to be able to contact you, inexpensive business cards with your contact or website info can be placed into cheap card holders around your tent.
Good luck - and have fun with it!