I know that the "Subscribe to Artists" feature is being planned, so I have an additional feature that would make the artists happy.
What if all artists that I subscribed to were able to tell me about their next upcoming show in my area? Not in a blast email about the entire upcoming tour, but in a targeted message, "Did you know the Lumineers are playing in Denver, CO on May 11th? Click here for more information."
There exists a Spotify app called Songkick which does exactly this. Also the concerts are displayed on the artist pages and you get recommendations for concerts in your discover tab. ;)