You can build or rent an actual photo booth for your party (the kind where you go in, draw a curtain and say cheese) or create a photo-taking backdrop where they can gather and strike a pose. Either option is exciting, but the backdrop works better for big group photos. Whatever way you do it, remember to add plenty of props to keep the photo booth fun going all night. For the entertainment, have them play traditional picnic party games such as potato sack and relay races, This way of cutting loose may be just what your guests need after sitting through a stuffy ceremony in their caps and gowns.  Another party game idea is to go back in time and have your grown party guests play games from their past, such as musical chairs, freeze dance, or the piñata game. Before the party, copy and enlarge your guests’ yearbook photos. Hang them on a wall and set up a nearby table with markers and blank tagline cards they can fill in and tape beneath the pics. You can also throw in some funny superlative suggestions, such as Best Selfie Taker, Most Likely to Become a Reality TV Star, or Most Likely to Sleep Through the First Day of College. With just a few of these prompts, guests are sure to come up with plenty of silly superlatives of their own. Add some sentiment by having each classmate say something special (favorite high school memory, a wish for the future, etc.,) before sending off the lanterns.