Maybe initials in Photos Graduation Decor. Organize printed photos in the shape of your graduation year, add festive colored balloons for an added touch for your graduation decoration to hit the guests with a fantastic and stunning visual effect.
photo display for a party - double sided so they can spin a little. / you could do these right beside the hanging table. Maybe use streamers in your colors to hang from the exposed trusses to kind of add color and a block from the big empty space.