Well done. That is a fun gig. My wife's been a Girl Scout Leader for over 35 years. Last year her troop did a presentation on Scotland for "Thinking Day", and I was drafted as part of the show. I had a slightly larger age range for an audience, but still kept it short to avoid boring them. The girls in my wife's troop had done all the research on food, culture, national info, etc. and handled that part of the presentation. I was just "window dressing".
I have a gig coming up next month at a Children's Museum. Sort of a barter arrangement. I give them a couple of hours of time for their event, and they give my wife's Girl Scout Troop and program at a later date.