Aldistar is an artist on site who has sold some of her work. Perhaps she can help you in terms of selling artwork.
Not knowing any particulars on this event, will you be allowed to set up a table where you can display your artwork? If so, pick your best work. Don't try to overwhelm the audience with your entire oeuvre.
If you intrigue a few people then let them come to you to make arrangements to see more of your work.
As to approach gallery owners outside this arena/special exhibit? It might be best to have an agent act on your behalf.