An open house is underway right now at Shreveport's General Motors assembly plant -- and you're invited. But spokeswoman Donna McLallen says there are a couple of things you should know before you go -- you must wear closed-toe, closed-heel shoes and minimum age is seven. Also, she says make sure those shoes are comfortable because it's a walking tour. McLallen says GM officials are giving the guided tours of the plant so you can see, first-hand, how the Colorado and Canyon pickups are built. The open house lasts until four this afternoon.