Sure, there are some people who are invested in the cause, they're not social events only. But a large number of those showing up are not, they're there because their friends are, because it's an event and something to do, and because they want to belong to a tribe, and tribal outings are the thing to do when you want to be a part of the tribe.

Most of them don't want that more than they want to stay dry though, so bad weather usually translates into smaller events.

That's a ridiculous assumption to make. You have no idea what percent of any crowd is there to appease someone else and any claim otherwise is silly.

What if someone is there for more than one reason(Hint everyone)? Do they not count anymore?

Bad weather lowers attendance for all events you dullard that doesn't support anything you've said. You're just ascribing intention to thousands of people and it's really lazy thiking. You haven't even scratched the surface of why some people are there but go ahead and keep making your wild assumptions