Nokia’s N8, a Symbian^3 device, comes with a service called Here and Now. This reads the cell tower information you’re currently connected to and opens a web page detailing the current events (cinema listings and weather, for example) near you. I’ve done a quick port to Maemo 5 and the N900.
Once installed, you can launch it like any other application:
Without using a GPS, it sends your approximate position to Nokia’s servers and shows you what’s currently going on: