ST. LOUIS, MO - July 3-5th. The Fair Saint Louis Foundation 34th annual Fair Saint Louis in Forest Park in 2014. “America’s Biggest Birthday Party” will be centered on Art Hill and include activities July 3, 4 and 5. The event will include traditional Fair Saint Louis favorites, such as headlining concerts, spectacular fireworks and a Kids Zone. In addition, the Fair will introduce several new and exciting programming elements that will be unveiled early next year.