I live in Olathe KS(its right in the middle of that area)...There's a great one called Knit Wits on 135th and Riverview in Olathe, but I'm not sure if they offer classes. Their phone number is 913-780-5648. They are only open tuesday through saturday, but the ladies there are SUPER helpful! There is also one in Independence MO called Knit Craft, and they have a website www.knitcraft.com
I hope that helps you! If you need anything, please let me know!!!