Well, it does say on the cover of the flyer for the meet and I quote, "DEALER HALLS Open to Public". Emphasis on the plural of Halls but I couldn't find any specific information in the booklet. So I don't know if they mean the Orange and Purple Hall or the Orange and Black Hall (modular layout) or all three halls.
I thought the public was allowed in the Black Hall. They most likely are. I think it would be silly not to allow the public in the Black Hall.