An article on this site had a blurb about the top 3 St. Louis MEtro Area art shows, although one is Cedarhurst, which is about an hour away from St. Louis.
The other two include:
*"The St. Louis Art Fair, formerly known as the Clayton Art Fair, transforms the downtown area of this mini-St. Louis suburb into a colorful collage of upscale art. In all, about 160 artists from around the world display their wares. The fair is consistently ranked as one of the nation's top five outdoor festivals. The event takes place every year in the middle of September, after the Labor Day weekend, and the admission is free, even though the art for sale is anything but."
*"The Third best art fair in the St, Louis area: The Schlafly Bottleworks Alternative Art Fair in Maplewood. This fair features, well, alternative art. The kind of stuff that you might find in the small coffee shop where the guy with the goatee keeps the beat with the bongos. Maplewood, right on the western outskirts of the city, has had a recent revival of sorts. A number of small art shops and small, trendy restaurants have popped up along the main drag in recent years. This festival definitely feels more like a street party, with rock and roll music and a younger crowd. The owner of the Schlafly Bottleworks decided to stage his own art fair a couple of years ago when he was snubbed out of the beer tent that he used to have at the St, Louis Art Fair in Clayton."
These shows may be well worth checking into...