Already done: Just go to http://www.wherevent.com/ http://www.wherevent.com/ and check your city. Simple idea but very powerful—you don't need more. They have

Already done: Just go to http://www.wherevent.com/ http://www.wherevent.com/ and check your city. Simple idea but very powerful—you don't need more. They have to put on some filters and integrate some more streams (ie. meetup.com) and then it's perfect.