The back circle track in the back during the '77 125 GP weekend was crazy! Dirt bikes racing around all evening and night then they would get run off by 4x4s then DBs would take back over, it was muddy Saturday evening. My brother and I put our Coleman lantern on a 55 gallon barrel to mark the north end of the track at night so the bikes could see that end of the corner/track. Someone lost it on their bike, slammed into the barrel and took out our lantern.
The mud bog truck pulls at night were a year or two later I believe. One night there were 1k or more drunken fans around the pit and two trucks were in a tug of war. One blew up and the fans started chanting "burn it, Burn It, BURN IT!" with lighter blazing, the driver got out of his truck and pleading for help to get it out of the mud before in got torched.
One of that last years when DBs were banned fans would sneak in some. On a Saturday night near the main entrance cross roads/food vendor area there was a couple of sheriff deputies trying to catch a fan on an XR75. The XR was stock so it was quiet, he would come out of the dark/circle of fans and roost on the deputies then dart back into the dark/crowd, then come out of the fans/dark from another direction and roost then again. This went on for 10 minutes or so, it was hilarious! I got to get ready for work but I got at least a dozen more drunken great stories! Like has been mentioned, unforgettably burnt into memory! If only we could go back 44-46 years ago!