I've come to view interpretive programs as entertainment rather than education, per se. Another avenue for honing your provocational interpretive skills is in writing, for example program titles, descriptions, and articles. Through use of imagery, alliteration, and metaphor, you can draw people into articles as well as classes. It has to sound appealing enough to compete with myriad other choices for time, such as TV, sports, or shopping malls. Places to seek inspiration include newspapers and books of poetry.
Good poetry is based in good imagery.
A sports writer once produced an article about a new state record carp someone had caught. Paw Paw Patch and added activities and games. Provocation is not always positive. For example, I attended an anti-litter program given by an interpreter at Yosemite, and it was a litany of photos detailing the harmful impacts of refuse on wildlife and the environment. The negativity in this case was thought to emphasize the harmful impacts of litter in order to stimulate the desired behavior.