You don’t. The Universal Slideshow simply shows you random images that are created through an algorithm. It is possible to find an image of your choosing, but you cannot find an image that depicts an event that hasn’t occurred yet, unless you are really lucky. Because although the image of that past and future exist in the slideshow, you would have to go though an insanely large amounts of junk images to find them. And you don’t even know if it is accurate or not. The slideshow is an experiment, to show how every possible image exists within it, but it only has meaning if you attach that meaning to the image itself.