My old elementary school asked me to do a presentation for kids. They managed to pack the biggest classroom with about 70 kids and few adults, sharing chairs, and stealing them from other classrooms. With audience ranging from 3rd to 8th grade, I had to make sure everybody can understand the topic, so I chose to talk about the coolest Microsoft technology today - HoloLens. Using only publicly available videos and a lot of explanations, they got the idea so well that some of their suggested HoloLens projects were very similar to examples I saw before even if they never saw them before. This was very cool experience, even if it was exhausting trying to control so many kids of various ages.
Media was represented by two TV stations, one radio and a local newspaper. No pressure.