From the site:

Come to Collinsville, Illinois to be a part of the fest devoted to all things horseradish celebrated the first weekend in June in Uptown Collinsville on Main Street.

Where else can you learn how to prepare your own horseradish, join in any of the classic Horseradish Festival Contests, visit the Craft Village, or just sample the food and listen to the Live music. A large Family Fun Area is also located on Center St. and the City Hall parking lot.

Admission, musical entertainment, and parking are free.