GreenGrow Expo Saturday-Sunday Oklahoma Expo Hall State Fair Park 3213 Wichita Walk greengrowevents.com 405-600-7837 $21-$169 The Oklahoma medical cannabis industry will see its first major trade show this week at State Fair Park. GreenGrow Expo is 10 a.m.-6 p.m. Saturday and 10 a.m.-5 p.m. Sunday in Oklahoma Expo Hall and open to the public, age […]