Concert Archives is an online database of, well, concerts. Their system is not that great, but it does a good job at archiving important information regarding, mostly, mainstream shows, but also underground gigs and other things, including cancelled shows and such.

It'd be useful to have a URL relationship type for the website for events and for places as well, as you can see here:

https://www.concertarchives.org/concerts/blink-182-pierce-the-veil-bb70b34c-902d-4cdb-9f0d-8291038b8229

https://www.concertarchives.org/venues/rogers-centre