Money raised from a Knoxville elementary school students lemonade stand will be used to fight childrens cancer. Tierney Heffron and her mother Genni encourage the community to stop by the lemonade stand today from 11 a.m. to 4 p.m. at the Knoxville Hy-Vee, and then from 5 p.m. to 8 p.m. at the Knoxville Raceway during the races, where they can have lemonade for a free will donation.