At 1:25 in this video of the end of the fifth and final game of the ALDS in New York, 8 year old me was somewhere on the field grabbing a handful of dirt and grass by second base. https://www.youtube.com/watch?v=wEpZVxPM1Qw
It was a different world back then. And that was nothing, at a single Red Sox/Yankees game in the 90’s I saw 7 huge fights, 3 fires in the stands and probably 20 people run on the field during the game. It was right before the mayor (Dinkins maybe) started really prosecuting people for trespassing.