I've done a few Educational Shows (birthday, Science Fair, and for a 1st Grade class), and I'm also a High School Chemistry and Biology Teacher, so my students get frequent shows throughout the year. All of my reptiles have been selectively chosen for their ease of care and temperament, as I keep many of them in my classroom.
Here's a list of reptiles that I have in my classroom/have used in a show: Bearded Dragons, Blue-Tongued Skink, Albino Ball Python, Normal Ball Python, and Russian Tortoise (captive bred). I give information on what country each animal is from, habitat, foods they eat, and captive care. Here's a couple pics from the San Diego Science Festival earlier this year.
Blue-Tongued Skink
Russian Tortoise
Note: the animals were painted with non-toxic face paint which was easily wiped off after the show. I also like feeding the animals in front of the audience (Super Worms for the lizards, frozen/thawed rats for the snakes, and veggies/fruits for the tortoise). No I have never had a problem with my ball pythons feeding during and after the show.
Mark