This is a Mac Dashboard widget which lists upcoming events on last.fm
It can search by location, artist, recommended events or those nearby.
Location lookups can either be done with GeoNames.org or last.fm native geocoding (geonames is more accurate, last.fm is a little faster)
The widget can get your recommendations from last.fm - flip the widget over and authenticate...
Has support for locating the user through Skyhookwireless based on nearby wireless access points. This will only work in some areas, try it by choosing "Nearby" from the popup box.