The Bandsintown Ruby SDK by Mike Constanza can access the API to implement a database of future concerts, calendars, and tickets into applications. Usage demonstrates how to find events according to artist, citiy, and venues. Documentation at http://www.bandsintown.com/api/requests
When it comes to sharing personal data, Robert Scoble lets it all hang out. He is not afraid to tell people anything about himself, because he believes that the information mobile devices and sensors and apps collect on him can improve his life.