Good luck! Hope you have a perfect weather for shopping day and lots of buying customers.
Don't know how many items you have - as a shopper, too sparse looks uninviting - but too cluttered is also a turn-off.
The suggestions for your personal comfort are also good. Might even want to pack a bit of extra bathroom tissue - just in case.
If you don't get a cover, maybe plastic sheets or tarps to cover your items in case it rains?
You might want to also pack a few hand wipe things - and maybe some cloths to wipe down your space, if necessary.
Also, nice table covers help the presentation.