While we're talking about photography, I must say that I'm terrible at remembering all those names. One trick I use is this. I date and number the disposable camera. I then reserve pages at the back of the steno pad with a date and number at the top of the page corresponding to each of the cameras. I number the lines of each page for each of the pictures on the roll of film.
Digital cameras are terrific, too, for capturing pictures as data.
However, keep in mind that technology changes quickly, and you are going to want to continue converting your digital photographs to new technologies as they evolve so that the images are never lost to future generations. If you have a video camera, you may want to supplement your genealogical experience by making videotapes. Videos can capture motion pictures, voices and sounds for you. They can become a wonderful part of your genealogical collection. If you plan to video people at the reunion, make sure they are not uncomfortable.