The American Visionary Art Museum's annual Kinetic Sculpture Race comes through Patterson Park starting around 1 pm, but you can catch it all day throughout the city.

From AVAM : "Don't miss this race through Baltimore of wacky, imaginative, TOTALLY HUMAN-POWERED WORKS OF ART, DESIGNED TO TRAVEL ON LAND, THROUGH MUD, AND OVER DEEP BALTIMORE INNER HARBOR WATERS, constructed out of used bicycles, gears, and parts, created by a lunatic genius who tinkers around in the garage or backyard (do you know this person?)!"

For the route and more info, visit AVAM's website.