@karotte it was done in post, just very well synced and composited.
there was a neat trick for some of the country introduction stuff where they ran lasers from the back of the hall with projection mapped graphics "drawing" the logo onto the primary video panel at the far rear of the stage, with the sizes and angles set up so that when the mid-field overlay was applied in post it all lined up, like the lasers drew through the VFX overlay and through to the back display. really clever.