Some time ago I was asked by a school institution to conduct a lesson for children about filmmaking. I'm not a teacher, I never attended any pedagogical university and I don't have qualifications to teach in school.
I was invited as a guest to talk about my profession (filmmaking) and to inspire children to create movies, teaching them a little bit about software, copyrights and equipment. Of course, during that lesson the real teacher was present as well, but I was the one giving a speech.
Question: What was my role? Was I a tutor? A teacher? A trainer?
I want to include this as a volunteer job in my resume, but I don't know how should I call it. The best I came up with is Education Volunteer, but I'm not sure it's good in that context.