That is a good time of the year in St. Louis...any later and the heat and humidity would wrinkle our smarts.Previous Midwest rallys were in early June, as were the 2010 Nationals that replaced the Midwest event that year. Sort of traditional at this point.
2012 Midwest Rally - Smart Car of America Forums : Smart Car Forum
Dells 06/11 - Smart Car of America Forums : Smart Car Forum
If a person could add a day or two before or after the event there are some fun things to do in and around St. Louis.
A float trip (traditionally in a canoe but a kayak is more fun) on one of our crystal clear spring fed rivers with beautiful bluffs is a real treat.
Our zoo is one of the top zoos in the country where almost all of the animals are not in cages but in viewing areas sculpted to mimic their normal surroundings. And it's free! As is the Budweiser Brewery tour and Art Museum.
A trip to the top of the Arch is not free but the trip up the legs of the arch and the view from the top are exciting. If the Cardinals are in town try to catch a game.