PRGE don't mind Attendees trading as long as you keep it to like bringing in a small bag full of stuff, as for vendors, many will if you have something they want and you're looking for a fair trade. we don't have any official "meet up" places to do trades! but you can work that out with a vendor you might want to do a trade with.. most vendors are willing to do it at their booth..
good luck! and enjoy our show!
Rick