Hey Barry, glad to hear you made it to the talk and thanks for writing up the report
Much appreciated. I'll just add that it was indeed a very good turnout (over 100 people I believe, as the theatre can seat 100 people and there were many standing up or sitting in the aisles) and there were more kids there than I expected, which is a great sign. It's hard to convince little ones to sit still for an hour but sit still they did (and most were quiet...)
The talk consisted of many pretty pictures and the speaker used those images, made in all different wavelengths (i.e. radio, near infrared, mid-infrared, optical, ultraviolet and x-ray) to highlight how astronomers can use such images to discover many things about the structure of stars, galaxies and nebulae. For example, radio waves can show the existence of more extensive structure between what seem to be non-interacting galaxies optically, and which may also show up in x-ray. Infrared images can tell us where the dust and ultimately, where star forming regions are (because you can peer through the dust to see the young stars). Higher energy wavelengths (x-rays etc) tell astronomers where the action is - that is, the sites of black holes, galaxy mergers and supermassive jets. The different wavelengths also tell us about the structure of different types of galaxies - where the old and young stars are, where the massive stars are, which in turn, give astronomers clues to galaxy evolution.
I particularly liked the 3D animation of the fly-out from the Milky Way (starting in front of Orion), then flying through Andromeda and heading out toward the local group, finally reaching the hubble deep field image. He also showed a successive series of zoomed images starting from the Large Magellenic Cloud, going in near the tarantula nebula, then zooming in further until he reached about 1pc (I think that's what the final field of view size was...I can't remember!). Anyway, the animation was very good but the explanation of what was happening could have been more explicit, especially for the little ones in the audience.
I'd say the talk was aimed at high-school/first year introductory astronomy level. There was not much physics involved at all and I think the images and 3D animations really helped to gain people's interest in astronomy. Overall, I enjoyed the talk and it was really a shame about the weather not cooperating.