Yeah I'm curious too. Did you try Zvents, the company mentioned in mrbirds link? Which city? I normally live in London where a big problem is filtering the events for the cool stuff as there's >1000 things/week. Never heard of Zvents before.
If you're in New York City and enjoy house, funk or soul music, I highly recommend DanceDeets[0] for a carefully curated list of events, some of which would be difficult to find otherwise.