I think this is a really interesting idea. Spotify has a feature where you can see if an artist is going to be playing near your location by going to the artist's page and going to the 'concert' tab. However, I don't think they have one to go the other way i.e "find all artists performing in one location"

Someone at the SXSW Hackathon two weeks ago worked on a similar thing [1]. The difference in their project was that it looked at the artists you listened to and then created a list of artists that you would know who would be coming to the venue.

I like your idea in that you're creating a channel for people to discover new bands.

[1] https://devpost.com/software/sx-setfinder