I was super curious why Ciyou (a person with questionable opinions on "freedoms") is a a faculty speaker for the Firearms Law Seminar, but Relford (strong 2A defender) is not??
I don't think any vendors will be there, Honda. You are dealing directly with the manufacturers, not vendors.
I have purchased things such as pistol stocks, clothing (bison clothes), art, and a poster of cartridges. The NRA Store has books and other merchandise for sale.
Don't forget that you will be carrying 118 pounds of free catalogues when you leave.