I do that stuff but I stick to Unreal and Level Design lectures. I think it is weird that they contact you to speak for people that are outside your field of expertise. Perhaps they just want to have you talk about the industry? It doesn't has to be about your work, you could just talk about how to get a job in this industry, how most post graduates feel when they start their first job and their common issues. That kind of stuff.
Or you could explain level design to the artists so the artists understand the position of the LD better and why they can't just move a crate when they want, for example.