Growing up in So. Cal, we did that at
Disneyland. It was fun. The first Grad Night ever was in 1961. My dad missed it by a year, and my mom's graduating class was just a few years after that. My brother enjoyed it as well a few years before I did. Being the Disney-geek I am, naturally I was the one the class voted for to be Grad Night Chairman...but that was pretty cool in itself... since I got to go to D-land twice in advance for official "pre-planning" tours and "preview" various attractions (read - they walked us right on as VIP's skipping the lines entirely). Then a couple of years later I went back as a Chaperone at the school's invitation.
While it's not very good, a bit blurred and I'm not looking at the camera, here's a pic of me, my date and our DDC buddy on Grad Night 1988.