Qdrome,
You're thinking of the '82 US Festival. I know because I was there, pressed right up against the boards in front of the Dead as they came on in the morning. Awesome show! I also know that the event was extensively recorded because there were cameras in my face all day. However, having emailed Steve Wozniak a couple years ago regarding this very topic, I learned that none of the footage is available for release due to legal/contractual snafus with the various parties involved. I've found bits and pieces of the '82 event on ebay (personal video camera stuff), but nothing worth getting, and nothing on the Dead. I guess we'll just have to wait...