MidAmeriCon (1976) Worldcon - Star Wars Q&A
https://www.youtube.com/watch?v=gmhjvkj8_aw&t - from the FANAC Fan History YouTube channel (27 mins long)
The blurb:
“MidAmeriCon, the 34th World Science Fiction Convention, was held in Kansas City in 1976. Before the film was released, before Star Wars and George Lucas were household names, producer Gary Kurtz, star Mark Hamill and marketing director Charles Lippincott came to MidAmeriCon to promote Star Wars. This Q&A session is full of fascinating background information about the film, the filming and the attitudes of the Star Wars team. For example, listen to Kurtz talk about the massive $18M gate they would need to break even. This is brought to you by the FANAC Fan History Project, with video from the Video Archeology project (coordinated by Geri Sullivan, with technical work by David Dyer-Bennet).”
MidAmericon (1976) Worldcon - The Preview of Star Wars (interview with Charles Lippincott)
https://www.youtube.com/watch?v=QoKK-aFcQIg - from the FANAC Fan History YouTube channel (3 mins long)
Episodenothing blog link discussing the convention and the Q&A video.