A longtime volunteer at the Louisa County Fair is being inducted into the Iowa 4-H Hall of Fame this weekend. Mike Hendrickson started volunteering at the fair when his children began participating in 4-H, and continued after they left for college. Hendrickson no longer lives in Louisa County, but continues helping out with the fair. This year he worked at the sheep weigh in. Louisa County Extension Program Manager Kathy Vance says his nomination was done as a surprise. Hendrickson will be joined by his wife at the induction ceremony Sunday afternoon.