Also, apologies for the inconvenience here. The best thing to do is to get back in touch with Songkick support and explain the issue with as much info as possible. As they are the one's who manage this, they should be able to help or provide info as to why this is happening.
I can see them. I just can't see them on our discog page where they're supposed to be, which kind of proves that their end works.
Songkick insisted they had exausted all options and it was Spotify that deemed where the content is displayed.
Personally I believe them.
I am not making this up.. Dude even Adele (the worldwide, mega succesful artist) even her concerts are listed in your system and they're not on her bio page. YOUR FEATURE IS BROKEN! I am trying to do you a favour.
Use the mobile app to find a local concert in your area and If you can find said concert in your area displaying on the artists discog page please prove me wrong.