Location: Skylight of Lobby 7
Date: September 6, 1994 (Registration Day)
The LSC movie for Registration Day of Fall Semester, 1994 was Jurassic Park. On that day, the center of the Lobby 7 skylight became a Jurassic Park logo--red with a black silhouette of a dinosaur skeleton in front of an MIT skyline.
More pictures -- these are mostly slight variants on the one shown above.