I would suggest adding new category to content database similar to Sport Events.
Concerts are neither movies nor tv series (However Daryl Hall with performances at his home may be exception) Sadly even Plex or Infuse does not recognize these type of broadcast, and there would be different set of data required to better organize it in database (similar to how classical music needs to have more tags then pop music)
Using Personal Media, you can import videos and add any Category that you want. Concerts are one that already exists.
You can even use this in already recorded content.