Well, for what I have seen, there are mainly two places to sell art.
First is the Art Show. While some of the art will not be on sale, it seems quite common to have some sort of auction running during the show's display time, with the most sought for pieces been placed in a seperate auctioning event.
This is the usual method of selling either originals or limited prints of 3-10 copies. About.
The second place of marketing is the Dealers Den. You usualy see prints, cards, buttons and just about anything "mass" produced being sold there, as well as commissions, con badges and sketches.
As for the details of the Confuzzled Art Show, I'm waiting for the details as well. Got a few pieces I'm thinking of showing there, as well as a couple of paintings I'm working on to be put in an auction.