Make a few of these from found/reused materials and decorate them as "FEST-ive Fun" boards. We can then let fest goers add pictures, signs, art, etc. with a roll of duct tape that we have hidden/tied under the sign frame. For each sign we'd need a hinge or two, a roll of duct tape, and some "festive fun" heading graphics or handpainted ones
chalkboard sandwich board Get two boards from Home Depot. They were pre-cut to this size so no waiting in line at the cutting tool. Get a pack of hinges. Screw the two boards together. Aubrey used glue to reinforce the hinges as it was going to be transported to the resort. But you could skip this step.