If you have power available you could have a printer/copier. Also make some
good signs, and handouts along with your cards. If you have a laptop it
would be good to help show off your online art. Or showing your art like
one of those digital picture frames.
If you can draw fast bring a sketch book too..
Remember it's all about getting the public's attention.
Good luck
Oh make sure you take a friend or someone to watch your table so you
can get away.