Chicago’s Women-Only 5K: Pretty Muddy in Orland Park September 5, 2012 The Pretty Muddy women’s mud run is arriving in Chicago on Saturday, September 15th at Pretty Muddy Farms in Orland Park. And if you hurry, you can register before the event sells out! What can you expect? A women-only event featuring obstacles, great activities, a pretty awesome after party and yes, the opportunity to get muddy.