August 19, 20, 21 at the Rochester Minn. Fairgrounds-----and Oronoco, just north of Rochester.
Great flea market--always with tons of tools and everything else you may or may not need.
Just Google: Gold Rush Days
The other two-location event is Sept. 1,2,3, and 4 at Sparks, Kansas, on K-7 highway in NE. Kansas, and White Cloud Kansas, just north of Sparks. Google: Sparks flea market
Both will wear you out and give you lots of good buys!