 They carry a variety of building products to get your project done right. For all your home improvement needs, stop in, talk to Tim or Kim or any of the staff. Northern Lumber, Crookston. Take in the free stage events at the Polk County Fair July 10th through the 14th. Wednesday, chocolate contest and karaoke. Thursday, it's 4-H demonstrations, performing arts and talent show. Friday, comedy and children's show. Hypnotist, Dreamweaver, accordion band and wood picks.