I agree…shouldn’t be too hard, but you will have to just sit there and sync stuff up.
Put your audio down on the timeline, with all your camera 1 video, in order it was shot, above it.
Select all the clips, and move them until the first video is in sync…then deselect that clip, and move the remaining clips until the second video is in sync….keep going until all of camera 1 is in sync. Repeat for Camera 2.
If you listen to the camera takes, you should be able to get a pretty good idea of where they are in the concert…song 1, song 2, etc. That will get you half way there right away.
Its not a perfect scenario, but within an hour or two, I would think you would be in sync.
Not everything can be solved with an “auto” button.
Unfortunately, when there isn’t any production workflow discussion before the shoot happens, the post guy ends up paying…(hopefully through a clients wallet)
Glenn