Not Woodstock, but lived within shouting distance of the Altamont Speedway and remember seeing heckalopters flying up and down the freeway and people walking from parked cars along I-5 thru Livermore CA. PARTY goers umping off overpasses, campers getting run over, Hell's Angels as security..... now That was a mistake. Landowners walking their fence lines with shotguns!
TPBM missed them all as well.