The countable ones are.

The parking lot is absolutely countable is my point.

The fans do not all fit in the stadium. A game day at Neyland has thousands outside the stadium there for the game as traveling fans into Knoxville. The traffic is an nee after a game, and downtown is a mess to be avoided.

Anyone who travels by car for the game to the site of the game, whether they fit inside the stadium or not, is absolutely a fan. Since they pay for parking to do BBQs in the parking lot, are issued tickets for this, and are traceable; it seems relevant to call out their existence.

If you want to strictly define attendees inside that study ms that is fine, but it does paint a different picture than that on the ground of many events.

I wonder if you could add college sports that feed each league.

SEC football for example has Knoxville gathering 120k fans for a game on the regular.

Would be interesting to see those feeding leagues, and even more so it you graphed funds associated with those leagues on a vertical axis for each.