Escapade is the longest running slash convention in the US. They have an art gallery and an art auction and they are looking for fan art. They accept any and all media fandoms along with slash, het, gen - all is welcome. Crafts, notebooks, Kindle covers and other fan art creations may also be submitted, This year they are also hoping to do a digital display -- something that may be of interest to digital artists. A "County Fair" with quilts, baked goods and preserves is under consideration. And last they are hoping to reserve a special gallery section for premiering art.
More details here
(please feel free to forward or post to other groups here on LJ, tumblr, deviantart or wherever fan artists can be found)