Russ,
I am definately not old enough to have seen any of these groups live. I am 16 and live in the Seattle area, but i am active in the traditional jazz community and I remain in contact with the living members of the Firehouse Five Plus Two. There are three, but one of them is too drunk or something to answer my calls or emails. The other two George Probert (soprano sax) and Don Kinch are very kind to me. In fact, my first tuba was Don's old horn from the Firehouse Five. My other horn is from the Guy Lombardo band, but that's another story.
Depending on where you live, there may be some trad jazz festivals near you. It slips my mind right now about where you live, but if you want to discuss this further, backchannel me.