My barn holds a few one-week camps throughout the summer. During one of them, the vet came to do a few horses' teeth (mine was one of them). Even though it wasn't one of the scheduled activities, the kids were fascinated by watching & asking questions of the vet and ended up doing that for a while instead of the craft activity they had planned.
If you have a personable vet, farrier, or other professional and you also need some horses worked on during that time period, you might see if they'd be willing to take some extra time to do it with an audience and answer a few questions