2025 WIU Ag Mech Farm Expo. The Farm Expo, considered the largest student-run agricultural event in the country, will include displays of farm tractors and machinery, ag sales and service, ag management, emerging ag technology, livestock and crop supplies, conservation and ag structures. There will also be a variety of craft vendors upstairs in Western Hall, as well as free children's activities, including a bouncy house, face painting, and glitter tattoos.