I would get a couple of pieces of foamcore and make a couple of huge posters of your pictures to attach to it. They should be big enough for people to see from far away.
I just did a downtown event for my daughters' performing arts center and I made about 150 4x6 prints with info on them to give to people. I just made a stamp in PS that had all the studio info on it, then just stamped every picture. I printed pictures of some of the ballerinas, princesses and musicals that I've done and handed them out to little girls and boys (and parents) to advertise dance classes. The little girls (and some little boys!) loved them!