40 years ago, DAICON IV (the 4th Osaka Japan SF Convention) opened with the screening of the following short animation film.

The team who produced that short would become later GAINAX, after Bandai noticed and financed them to produce Royal Space Force: The Wings of Honneamise.

https://www.youtube.com/watch?v=j5-4-r3ReUU

Daicon IV Opening Animation (1983)

Opening animation for the Daicon IV science fiction convention, produced by animators who would go on to form the animation studio GAINAX (Gunbuster, Evangel...

^YouTube