I have Dawn. First, the place you're having it usually dictates where in a building the display
can be placed. They usually have the tables, the table skirts, whatever other fabric is desired. If they don't you'll need to know the size of the displays so that the vendors can bring their own (they often already have the skirts, etc.)
It's good to get to know the vendors. one time I had 2 who asked me to have their tables next to each other.
Having a committee was helpful for me. Each person was responsible for a certain area of town to pass out flyers, signs or whatever. That's wonderful you have someone in charge of advertising.
Our show also lended itself to asking for nice prizes and drawings from national vendors. they were more than willing to give if this was a yearly event and they were acknowledged.
Our event got so big the last 2 years we even offered a nice sit-down lunch for show guests.
I don't know if you'll have food or drinks. Sometimes food vendors, grocers will give nice discounts for school shows.
I hope this has been helpful to you in some way.