My parents were lucky enough to score tickets to the Salt Lake City winter olympics opening ceremony in 2002. I, like so many others, had to watch it on TV. From what I heard, my experience was nowhere near as fascinating as seeing all the events unfold face to face.
There are so many things like this, things that I only ever see on TV, and it's such a shame. I doubt I'll ever score opening ceremony tickets, but there are a few things I imagine I can see live. One of which being the Macy's Thanksgiving Day Parade. After all, I'll already be living in NYC. :)
While I imagine it is a complete madhouse getting to the parade, finding a place to watch, etc., life is too short not to at least try to see certain things in person.