Search through TV guides/ Entertainment and other magazines such as Business week etc and find pictures of famous people. Try to get a wide variety and some from an obscure angle so it's not always obvious who it is. It can be famous actors, politicians, leaders, religious icons, infamous people, inventors etc. Stick them on to two boards with around 25 per board and number the pictures. Boards do not have to be the same. Split your guests into two teams and give them a board each for a set time (around 5-7 minutes) and then swap over the boards. The team who identifies the most correctly wins. Be sure to keep track of the names and picture so that you have the answers!