For me 2 events stick out.
Tommy Hearns winning his first title at Joe Louis Arena vs Pipino Cuevas in 1980. It was the most electric atomosphere for a sporting event I have ever witnessed, plus Hearns knocked Cuevas out so quickly the energy never subsided.
1997 Michingan vs OSU. The feeling of satisfaction I felt after that game cannot be put into words. I felt so good for that team and Lloyd Carr, and when the team came back out onto the field and sang "it's great to be a Michigan Wolverine", I was truly in football's Vahalla