Sounds like you are expanding your fun factor. Getting a table is a great thing even if you don't have much to sell. Its a nice place to sit and rest your legs and meet new people that are table holders near you.
A bunch of buddies and I have some tables in the Blue hall as well. We are K-10-K 15 near the back unopened doors and small café. Stop by and say hi.
In addition to whats been posted, bring some snacks/drinks. You should consider pricing items before you get there. The 2 hours of getting in and unpacked goes by quick. If you plan to have a display shelves or pile up stuff there is a height rule. I think its 24 inches but cant remember for sure. If you have a small matt to stand on, those come in handy. Be sure to have price tags, pens, bags. A cart is helpful and trash bags that fit your boxes in case it rains during setup/breakdown. Take engines out of the box so people can see them.
There are definitely peaks and valleys so a project or book can be a good way to pass the slow times.