Take care of your own. How many of the Bill Graham crusade people have lived the lives they promised? The Lord’s parable about the seed on the path, etc. is still the best guide as to probable outcomes, whether pilgrimages of open field preaching.
I don't know because the Billy Graham stuff is not all one denomination but rather many churches and denominations working together.
This event is basically Catholic. The difference in holiness within the local Catholic churches ought to be easier to document.