Is there an app or site for discovering live music in my area but more for bands that are not so big and famous? Something like https://www.bandsintown.com but for bands that basically just use facebook events for promotion on the interwebs, and hang posters at the gig site?
For me, facebook's Events became basically the only reason i use facebook, so "for bands that basically just use facebook events for promotion" facebook should be the way to go.
"Like" the most important locations in your area and you should be good to go. Activate e-mail notifications and you don't even have to visit facebook to be up-to-date.
I don't think that aggregating facebook-events outside of facebook makes much sence - which value could be added? facebook does already a great job here...