Turns out Norweson has really old masquerade videos on YouTube. I was at this one, though it wasn't my first one. Watching it, I actually find I recall a lot of it.
Click to view
Norwescon IX: March 20-23, 1986
Red Lion Inn, Sea-Tac
Chair: Robert Suryan
Guest of Honor: Anne McCaffrey
Artist Guest of Honor: Kelly Freas
Fan Guest of Honor: Greg Bennett
Toastmaster: Spider Robinson
Science Guest of Honor: James Oberg
Attendance: (unrecorded but “HUGE”, unofficial estimates at ~3,000)