I remember the Hillsborough Disaster on 15th April 1989 at the football stadium home of Sheffield Wednesday. I remember seeing it on the news on TV when it had just happened - they interrupted the programme with a newsflash. it was a Saturday and I was round at my gran's house at the time. It ultimately turned out that 96 people had been crushed to death that day (all Liverpool FC supporters who'd been watching an away match) and was considered one of the worst football-related disasters of recent times. The match was the FA Cup Semi-final between Liverpool and Nottingham Forest and it was abandoned six minutes into the first half.
The Hillsborough Disaster brought about a redesign in football stadiums, after the Taylor report concluded that poor police control was the key cause. Football stadiums were made seating only and barriers in front of fans were removed.