It's a good start. If you take all the found listings within 50 miles, automate grabbing their descriptions from their artist pages and maybe a quick link to a sample song, put it in a table for each day of the week and e-mail me once a week, that would almost be worth money. It still lacks a lot of real local information but maybe there's more sites you can grep, i'm not sure. I remember all the band flyers used to be posted on myspace profiles, which might have also had descriptions of events that could be grepped too. Facebook and bandcamp and a few other sites are slowly replacing myspace for this, I think.
But if you want to make some money, you might have to spend the time/money to pull all these sources for each big metropolitan area (where you'll be making the most bank).
I don't know what the legality of this is exactly, but occasionally there are local sites which index upcoming shows that you could scrape from. For DC there's http://www.dcshows.net/, http://www.washingtonpost.com/gog/dc-music-venues.html, http://www.brightestyoungthings.com/events/index.htm, http://www.washingtondc.com/nightlife/localbands.html, http://www.dclivemusic.com/, http://www.washingtoncitypaper.com/music/, http://www.meetup.com/indiemusic-134/ and of course the venue website calendars which are probably a nightmare to try to index individually. The twitter feed of each venue can be a lot easier to grok (for example, https://twitter.com/#!/somethingl33t/dc-music)
But if you want to make some money, you might have to spend the time/money to pull all these sources for each big metropolitan area (where you'll be making the most bank).