4F Design in Ravenswood is giving one of their hand-screened products–an eyeglasses holder, a burp cloth, or a reusable lunch bag–to the first 50 people at its studio open house this weekend. Hours are 10 AM to 5 PM on Saturday and noon to 5 PM Sunday. Bring in a T-shirt between noon and 1 PM on Saturday or 4 and 5 PM on Saturday or Sunday and you can have a new design screened on it for free.